From the “law of unintended consequences” department comes this finding, suggesting that the push for eco-friendly energy savings may be doing more harm to us than good.
Study links night exposure to blue light with breast and prostate cancer
Researchers used images taken by astronauts to evaluate outdoor lighting in Madrid and Barcelona
A study performed by an international team led by the Barcelona Institute for Global Health (ISGlobal), a centre supported by the “la Caixa” Foundation, reports a link between exposure to blue light at night and higher risk of developing breast and prostate cancer. Blue light is a range of the visible light spectrum emitted by most white LEDs and many tablet and phone screens. The results have been published in Environmental Health Perspectives.
“WHO’s International Agency for Research on Cancer (IARC) has classified night shift work as probably carcinogenic to humans. There is evidence pointing to an association between exposure to artificial light at night, disruption of the circadian rhythm, and breast and prostate cancers. With this study we sought to determine whether night exposure to light in cities can affect the development of these two types of cancer”, explains Manolis Kogevinas, ISGlobal researcher and coordinator of the study. “We know that depending on its intensity and wave length, artificial light, particularly in the blue spectrum, can decrease melatonin production and secretion”, says Martin Aubé, physics professor at CÉGEP in Sherbrooke, Canada and study co-author.
The study was conducted within the framework of the MCC-Spain project cofunded by the ‘Consorcio de Investigación Biomédica en Red de Epidemiología y Salud Pública’ (CIBERESP), and includes medical and epidemiological data of more than 4,000 people between 20 and 85 years of age in 11 Spanish regions. Indoor exposure to artificial light was determined through personal questionnaires, while outdoor levels of artificial light were evaluated for Madrid and Barcelona, based on nocturnal images taken by astronauts aboard the International Space Station.
Results obtained for both cities show that participants exposed to higher levels of blue light had a 1.5 and 2-fold higher risk of developing breast and prostate cancer, respectively, as compared to the less-exposed population.
Ariadna García, ISGlobal researcher and first author of the study, says: “Given the ubiquity of artificial light at night, determining whether it increases or not the risk of cancer is a public health issue”. At this point, further studies should include more individual data using for instance light sensors that allow measuring indoor light levels. It would also be important to do this kind of research in young people that extensively use blue light emitting screens”.
“Currently, the images taken by the astronauts on the Space Station are our only way of determining the colour of outdoor lighting at a large scale, and the spread of blue light-emitting white LEDs in our cities”, comments Alejandro Sánchez de Miguel, scientist at the Astrophysics Institute in Andalucía-CSIC and Exeter University.
###
Reference
Garcia-Saenz A., Sánchez de Miguel A., Espinosa A., Valentín A., Aragonés N., Llorca J., Amiano P., Martín Sánchez V., Guevara M., Capelo R., Tardón A., Peiró-Pérez R., Jiménez-Moleón JJ., Roca-Barceló A., Pérez-Gómez B., Dierssen-Sotos T., Fernández-Villa T., Moreno-Iribas C., Moreno V., García-Pérez J., Castaño-Vinyals G., Pollán M., Aubé M., Kogevinas M. Evaluating the association between artificial light-at-night exposure and breast and prostate cancer risk in Spain (MCC-Spain study). April 2018. DOI:10.1289/EHP1837. Environmental Health Perspectives
The full study is here: https://ehp.niehs.nih.gov/EHP1837/
I did some research into this.
There’s a Harvard study on night light, and in particular blue light.
But we may be paying a price for basking in all that light. At night, light throws the body’s biological clock—the circadian rhythm—out of whack. Sleep suffers. Worse, research shows that it may contribute to the causation of cancer, diabetes, heart disease, and obesity.
…
While light of any kind can suppress the secretion of melatonin, blue light at night does so more powerfully. Harvard researchers and their colleagues conducted an experiment comparing the effects of 6.5 hours of exposure to blue light to exposure to green light of comparable brightness. The blue light suppressed melatonin for about twice as long as the green light and shifted circadian rhythms by twice as much (3 hours vs. 1.5 hours).
In another study of blue light, researchers at the University of Toronto compared the melatonin levels of people exposed to bright indoor light who were wearing blue-light–blocking goggles to people exposed to regular dim light without wearing goggles. The fact that the levels of the hormone were about the same in the two groups strengthens the hypothesis that blue light is a potent suppressor of melatonin.
…
If blue light does have adverse health effects, then environmental concerns, and the quest for energy-efficient lighting, could be at odds with personal health. Those curlicue compact fluorescent lightbulbs and LED lights are much more energy-efficient than the old-fashioned incandescent lightbulbs we grew up with. But they also tend to produce more blue light.
See: https://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side
So it appears that a nighttime blue light component equals less sleep and therefore more stress on the body. With more stress, then susceptibility to cancer increases.
I don’t know how accurate the methodologies in these studies are, but one thing is for sure, many white LED’s tend to have a larger blue light component:
Have a look at the CREE guide to LED color mixing.
In cool white LED’s, the two colors (blue and yellow) mix to create a white. This is shown below on the CIE 1931 color space:
Note: about 15 minutes after publication, reference to the Harvard medical study was added.
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The study is not well designed. “Self reporting” is a big problem. And satellite images as a proxy for personal exposure? Really?
Exactly. And the length of exposure—6.5 hours—is as ridiculous as the claims of many common FDA-cleared food additives causing cancer because the quantity administered in the studies are impossible to replicate in the real world under normal operating circumstances.
I wonder if the 6.5 hours is including time spent in front of a laptop/tablet screen. I am probably hitting that. And staying up too late. And napping too much. So I am doomed.
Who is spending tons of time being exposed to green light?
Then they should discuss the backlights of smartphones, tablets, laptops… not just conventional lights.
Is Michael Mann one of the authors? This paper ranks up there with his garbage. I believe this is the sad effect climatology has had on real science. In our world today, real news has been replaced by fake news, and now real science is being replaced by fake science.
so staying up at night causes cancer, eh?
well, then- ask little rocket man for data on n. korea’s cancer free population.
I hadn’t thought of that. A great control group if there ever was one.
Seriously, how could anyone survive night shift more than a week. They’d all be dead. Everything “causes” cancer as we’ve been told for generations now. Both studies are full of “may, might, could” weasel words.
Revolution – that’s part of the problem. As an ex-Kalifornian, everything is shown to cause cancer. Your home, your place of work, where you shop, where you get gas, proximity to power lines, carrying a cell phone, red meat, sunlight, caves, brick houses, bananas, Brazil nuts, potatoes, carrots, lima beans, BEER… EVERYTHING! So why give a crap? Like my ancestors, i’ll take my meager 100 – 120 years and die. AND enjoy life.
Strangely, none of those ancestors died of cancer. Well, those on my mom’s side eschewed beer. Didn’t have cell phones. Maybe that’s what saved them. But as farmers, it was always “Bring on the red meat, baby!”
I agree with you
Zurab………………….I agree with you too !
.
It SEEMS as though …….anything that will muck up the dreadful Capitalist system…………………………
such as……….. STOPPING PEOPLE working at night ! Using a computer ! etc
MUST BE TRUE…………………………and if not…………….then let’s apply the CAUTIONARY PRINCIPLE
as the IPCC espouses ………………….and ” be on the safe side ” and stop it anyway !
The Socialists MUST be having a hard time finding support IF they are going to such lengths
LET’S HOPE SO anyway !
Test all members of the study for serum Vitamin-D levels. Very low levels of Vitamin-D creates a significantly higher risk of such cancers. The body’s first—and main—line of defence against breast and prostate cancers is a high level of Vitamin-D. Taking Vitamin-D as a supplement doesn’t do much: get sun exposure.
The ‘Mediterranean life style confused everyone: it’s not the food, it’s the higher levels of solar exposure.
So: outside in the midday sun with your shirt off for half an hour (pale-faces) or an hour (max) for non-palefaces and make lots of Vitamin-D. Don’t use a sun-bed: UVA is useless, you need UVB.
The melanin deficiency of most Northern Europeans was to enable Vitamin-D production in low sun angle (low light) and cloudy conditions. The Nigerian coloring is the very opposite: it’s to protect against very strong and intense sun exposure. Seafood can be very rich in Vitamin-D.
Some sun exposure (UVB) is necessary for good health and cancer resistance. Over-exposure can damage and create what nature made Vitamin-D to cure.
Australia and New Zealand are the skin cancer capitals of the world with the highest incidences through over exposure but also the world’s highest survival rates, so maintaining Vitaman D is an mportant anti-cancer regimen. It also protects against coughs, colds and flus which always pass through a population at times of the year when vitamin D levels are at their lowest: late winter.
It’s more likely to not be LED wavelengths as an overall very low level of the human main anti-cancer protection: Vitamin D
Ref:
“Vitamin D status at breast cancer diagnosis: correlation with tumor characteristics, disease outcome and genetic determinants of vitamin D insufficiency,” Hatse et al, Carcinogenesis 2012 May 24
“The association between breast cancer prognostic indicators and serum 25-OH vitamin D levels,” Peppone et al, Annals of Surgical Oncology 2012.
“Vitamin D deficiency in North America,” Hanley et al, J. Nut. 2005;135:332-337.
:”Estimates of optimal Vitamin D status” Dawson-Hughes, et al Osteoporosous Int, 2005;16:713-716
(it’s good for yer bones, too!)
“Sun exposure, vitamin D receptor gene polymorphisms, and risk of advanced prostate cancer,” John et al, Cancer Res. 2005; 65(12):5470-5479.
A search in Google Scholar should turn up a lot more.
Enjoy.
Hmmmn. So, the the addition of the absence of blue rays under a sunny blue sky in Mediterranean climates does lead/does not lead to added cancers?
That should be “participants in the study” not members and not the researchers—although knowing their own serum levels of vitamin D might be a useful for them.
For UVB exposure follow the 50 degree rule. The sun must be above the horizon 50 degrees or you are not getting UVB. Both daily and seasonally. Where I live that means May to September and 11 AM to 3 PM.
Aus an Aussie who’s visited other parts of the world I’d say Aussies tend to be a lot more sun-shy than folks may think. Go to any outback area and you’ll see some of the palest individuals you’ll ever see as we scurry from wide verandah to verandah, covered in long sleeves and broad rimmed hats.. and there’s a reason for that, in the words of the great Ozzy Osbourne after a stop in Perth allowed him to get some sunshine ..”Well, I’ll just grab a bit of a suntan’. I sat on this wall for about 20 minutes and I was fried. I had to spend 30 hours on a plane on fire. “I don’t lie in the sun anymore because that frightened the crap out of me”
it can sting a bit being exposed to sunlight under the Australian sky
Vitamin D also helps MS. sufferers. https://www.mstrust.org.uk/a-z/vitamin-d
“The study is not well designed.” – I love the understatement.
Not well designed = total crap we made up to support our preconceived notions.
Read this with great skepticism…trying to imagine what the biological mechanism would be. Is it from skin exposure? Or is it from some sort of body response to optical exposure? In that case, would a blind person be immune?
agreed – I hate the blue lights, much too harsh, but I don’t want to buy into the post-science statistical methods used here.
I conducted a study of my own. It seems as though the very LAST string of outdoor Christmas lights at my local (national chain) hardware store was an energy-saving string of LED’s … not what I wanted, but beggars can’t be choosers. So I took them home, hurriedly put them on my house, set the timer, and never gave it another thought. Till my adult kids came home for Christmas and asked me what the HELL had I done to our usually festive outdoor decorations!!! Our house was a sickly shade of light blue!!! Then … the neighbor comments came. Welllll, they tactfully said … your lights are … uh … different this year. I didn’t wait till New Years Day, but stripped the lights off my house and tossed them in the trash. They were a CANCER to my familial and neighborly relationships.
Yes, I know that the “temperature” of LED’s makes all the difference … perhaps a string of 2,700 deg. lamps would have been more palatable. But … nevertheless … I have gone back to the ol’ planet-wrecking incandescents. Nothing says “Celebrate Jesus birth” like some planet-wrecking incandescent lights on a bible-thumpers (denier’s) SINGLE family home… eh… planet protectors?
[The mods trust that the WUWT community will recognize the lighthearted nature of this poster, and will not attempt to derail the topic into discussions regarding religion. Your indulgence (pun intended) in this matter is greatly appreciated. -mod]
kenji
Isn’t there a song about a blues Christmas?
🙂
Thank you moderator … for the proper treatment of my lighthearted post that failed to carry a {sarc.} tag.
I meant no disrespect to any religion, creed, or birthright. Esp. my Jewish friends who display blue lights at Hanukah. No .. my disrespect is directed squarely between the eyes of each and every know-it-all, nanny Statist bureaucrat who has removed incandescent lights from the shelves of the free marketplace. Every Marxist, Socialist, and outright card-carrying Communist who shoves their social science and manipulation down my gullet. I DO use LED’s … in ways of MY choosing. Not in response to some 1st world guilt complex.
HotScot: Here you go:
I guess we all should not go outside. Blue light levels outside at noon are many orders of magnitude brighter than what is present inside at night.
Likely the culprit they point to (or imagine) is melatonin.
For example, this is a problem in the domestic ferret, which is a crepuscular animal. That is, normally in the wild it is active around dawn and dusk, and sleeps much of the day in a dark burrow.
However, in domestic situations, people often keep ferrets indoors in a cage with no cover, and no dark place to sleep during the day. This disruption of the light-dark cycle messes with the normal release of melatonin, which in turn alters the release of other hormones.
While this may not sound like a big deal, research has shown that this light-dark cycle disruption contributes to “adrenal disease” in ferrets, which is a growth of tumors on the adrenal glands. These tumors can and often do become malignant.
I suspect the researchers are looking for a similar connection.
Thank you for that bit of technical knowledge that most of us would not be aware of. I think that melatonin is also likely to be key.
One must also remember that a survey is not an experiment; it is one of the sources of inspiration from which an experiment can be devised.
Jan
If it’s related to melatonin then there will probably be an association with non-24 syndrome among blind people, should be possible to check that.
we’ve more sensors that respond to various wavelengths than just our eyes, melanocytes in our skin absorb near blue UV to produce Vitamin (hormone actually) D – maybe the breakdown products in the biochemical pathways generate byproducts that instigate secondary action.. don’t know, wouldn’t rule it out.
Of course that’s just one known chromatophore, who knows what other ones we have – we keep finding organs and organelles that have been overlooked and discovering hey – these things do stuff!
I mean who’s aware that we have IR sensors as sensitive if not more so than a pit vipers across various parts of our bodies including our upper lip – do we use them? not consciously- but then we don’t even use our eyes consciously despite being aware what they do. Could other sensors be productive not just in a neural sense but in a biochemical sense? Heck we didn’t even know our eyes were used biochemically until recently in making hormones. ore research needed, research I’d support, not just to counter or support a health scare but rather to learn more about ourselves and the things that make us tick.
Karlos51
Every day’s a school-day.
Unless of course you’re a concencus climate scientist who can’t possibly learn any more.
In other words, they’re full of it.
But sunlight from a clear sky has enormous amounts of blue light. Do people who work outdoors have elevated instances of breast and prostate cancer?
Eustace Cranch sunlight from a clear sky has enormous amounts of blue light..
sure, but circadian rhythms and melatonin and so forth – quoting wikipedia which closely resembles material read elsewhere: “In vertebrates, melatonin is produced in darkness, thus usually at night, by the pineal gland, a small endocrine gland located in the center of the brain… Light/dark information reaches the suprachiasmatic nuclei from retinal photosensitive ganglion cells of the eyes”..
stuff at the ‘right time’ good, stuff at the ‘wrong time’ .. not so good. I don’t buy into it being causal of cancers – as others have said – show me the pathways – but I’m also open to learning and hearing more.
But how about red light though, that has some interesting properties when you go looking into it’s purported healing qualities despite there being little explanation as to why it may work
I’d like to hear more about both to be honest but we’re unlikely to do so unless research can discover pathways.
If you research the well-established link between shift work and cancer, especially breast cancer, I think you’ll find the pathways are somewhat well worked out and relate to disrupted melatonin
I think the main problem I have with this study, and many in the cancer field, is that it confuses ’causes cancer’ with ‘reduces the body’s ability to prevent and fight cancer’.
I highly doubt that the amount of blue light we are exposed to at night from LED’s compared to from any other sources could ’cause’ cancer, especially prostate cancer. (At least I know MY prostate isn’t getting exposed to much of it) but from what I know of Melatonin production, circadian rhythm, and related, it would make sense that exposure to a lot of blue light at night could inhibit the bodies ability to RESIST the formation of cancer cells and tumors.
It certainly is a field that is worth researching, but one needs to be aware that it is just as susceptible to the kinds of research puffing ( publish or perish, science by press release, bias, etc) as any other science.
“I think the main problem I have with this study, and many in the cancer field, is that it confuses ’causes cancer’ with ‘reduces the body’s ability to prevent and fight cancer’.”
The problem with this statement is that from a practical standpoint, from what I know of cancer, the “ability to prevent” is by far more important than reducing causes since all external triggers for cancer could be removed and normal cellular damage could still trigger cancer if the body’s various mechanisms (e.g. the immune system) for preventing cancer are weakened. This is apparently partly why Vitamin D level reduce some cancers but also strengthen the immune system.
Most importantly, there are clear actions to reduce circadian disruption that from cost/benefit risk/reward standpoint everyone reading this should be doing such as using f.lux, blue-blocking sunglasses for night computer work, supplementing melatonin when necessary, and using yellow light in their evening workplace. See Kent Noonan’s comments below. Paul Jaminet has written extensively about circadian entrainment. Health, like most other things in life is not about certainties, but about probabilities and taking easy, no risk/cost steps that may help is what those of us focused on optimal health do. We will not have perfect science to answer these questions in the timeframe which we need to make decisions, so we need to act on what we do know.
“trying to imagine what the biological mechanism would be.”
Exactly. They think they have found a correlation. Fine. Next step, come up with a biological mechanism to explain it. None proposed. So this is just another one of a gazillion quirky correlations.
But someone will publish it.
Is there a problem if people sleep under blue light? Or, is it just that they choose to be awake at night, and BTW, blue light helps keep them awake and alert? I’d need to see a lot more research before I got all hot and bothered by this. Then I could swap my blue LEDS for red LEDs, or are you going to tell me they’re bad also?
Somebody’s got too damn much money and time on their hands.
Apparently so!
You can correlate almost any two things. Great site: http://www.tylervigen.com/spurious-correlations There is a very high correlation between per capita cheese consumption and number of people who died by being tangled in their bed sheets, for example. Correlation doesn’t equal causation.
Current CO2 level vs. temperature being the classic example!
100% of those who drink water dies.
NOT True!!! All the soccer moms who have water bottles permanently attached to their hands … told me that “drinking 8 glasses of water per day” … will … SAVE THEIR LIVES!!!!
I wouldn’t put a whole lot of faith in the “association” between white LEDs and cancers. The bit about melatonin production being affected by whitish light is fairly well known; notice the software programs that will turn your video display screens more reddish in the evening. Things like “f.lux” for Windoze, or “Night Shift” on Apple devices, or “Blue Shade” for Kindles or “twilight” in Android devices. I use them, and I do sleep better than I used to.
Perhaps there’s some as-yet-unknown mechanisms by which lower melatonin production might increase the risk of some cancers – but I sort of doubt it.
i was about to mention f.lux
i DO find the shaded screen restful compared to the harsher white/blue normal screen at night.
i buy only the incandescent yellow normal lightbulbs they dont last as long maybe but at least i can see and read, with those cruddy curly things i can hardly see the edges of the room
Correlation does not prove causation and p-hacking is not a scientific method.
Warm white LEDs do not have more blue content in their spectrum than incandescents and warm color fluorescents do. Yet nobody is accusing incandescents or the blue light from fluorescents of causing cancer.
“…nobody is accusing incandescents or the blue light from fluorescents of causing cancer.”
Ummm, you should do some research before putting your foot in your mouth.
Possible Cancer Risks Associated with Fluorescent Light Bulbs
Ultraviolet Radiation
You wouldn’t think you would have to worry about ultraviolet radiation indoors but studies have shown fluorescent bulbs could pose a skin cancer risk. Studies have shown that the UV radiation is so strong, it could increase the risk for the development of cutaneous malignant melanoma.
https://www.askdrmaxwell.com/2014/01/fluorescent-light-bulbs-cancer/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1834365/
As for good old incandescents, that emulate the warm reddish glow of a fire… yeah, no cancer risk seems to be present. But we had to switch from incandescent to fluorescent and LED’s to “save the planet”.
Putting my foot in my mouth? Did I not say the *blue light* from fluorescents? You responded by bringing up ultraviolet.
And the original article caption for the satellite shots confuses Hg vapor with Na vapor color spectrums. Totally bogus, of course. Which puts the entire article in doubt.
I noticed that about the Barcelona street lights, too. Those might also be the multi-vapor lights, since cameras don’t record light colors the way our eyes do.
We had a white plastic thermometer on the wall in my brother’s basement about 4 ft from a curly cfl. After a year, the white had turned tan where the cfl uv was hitting it, but the back and far side were still white. I replaced the thermometer with a new white one, and sprayed the cfl with Krylon Archival UV varnish. That cured the uv completely.
Actually, the NHI paper cited shows no statistical increase in the incidence of malignancy with regular fluorescent lamps but does show the danger of ultraviolet tanning lamps and sun beds. So, from what I can see, there is no specific cancer risk from the light emitted by regular or curlycue fluorescents assuming their phosphor coating is intact.
Goes to show you should not expose your breast or gonads to outdoor night blue light. What are they thinking?
Why do you think that anybody related to this study actually thinks?
“Mays”,,. “mights” and other ‘hypotheses’ without testing, validation or verification. Pseudo-Science perfectly ready for publication in the Scientific American to scare people without regard to falsification. There should be a new ‘social science’ called ‘scare science’. It’s proven to be very productive in generating a lot of $$$ in grants and the grantees with bonus’s of more $$ for publishing articles and commentary in the popular media.
LED lighting is similar to fluorescent lighting. A phosphor is excited by a short wavelength and emits longer wavelengths. link
Fluorescent bulbs may emit a bit of ultraviolet and that can pose a risk. link Even then you have to be pretty close to the bulb. Most of the UV doesn’t make it out of the bulb.
The problem with LED lighting is that the blue light does make it out of the bulb. It’s needed to excite the phosphor and it’s part of the desired light. You could get rid of the blue light with a filter. That, however, would reduce the bulb’s efficiency a lot. It’s kind of a Catch 22.
The biggest problem with blue light is that it prevents people from getting sleep. link That probably does cause health problems.
The strongest association (odds ratio 2.8) was for persons with highly illuminated bedrooms. (subjective measure). Blue light not broken out by this measure.
The blue light effects are from outdoor measures. But people spend on average 6% of their time outdoors (1.5 hours). So for this to have an effect, it would have to be mighty powerful. But no mention of determining the amount of time spent outdoors could be found. A major flaw. If they found that time spent outdoors exposed to blue light was still (or perhaps more) significant, their findings would be slightly more believable. As it is, my money would be on this result adding to the great number of nonreproducible results in peer-reviewed articles.
If there was an effect it would be easy to see as the outside blue value would vary by something like 20 fold from arctic to texas.
Gateshead Council won’t like this…
https://articulatelive.wordpress.com/2018/04/10/gateshead-council-looks-to-cast-shadow-over-street-light-allegations/#more-5298
A curiosity becomes a pointer, becomes correlation, becomes causation.
Amazing!
N.B. This is the same IARC that fudged glyphosate results to produce their specious “Cancer causing” results.
Trust these not at all.
Thanks for the reminder.
I think very little of studies like this fron known corrupt orgs.
in a sister study….
Scientists discover whoring around late at night leads to an increase in breast and prostate cancers….
……film at 11
Also, apparently women who have been drinking are more fun to study:
http://www.satirewire.com/news/march02/women.shtml
rip
Maybe check out California and there LED streetlights some more to broaden the article?
https://edition-m.cnn.com/2016/06/21/health/led-streetlights-ama/index.html
Do my 3000K led bulbs put out a lot of blue light? The light looks yellow enough. Is this only a matter of color spectrum of the light?
The higher the K number the higher the amount of blue. Daylight bulbs typically have a K rating of 5000k. 3000K is a lot less. 2700K or soft white puts out almost no blue (over 90% is blocked by the phosphor). All bulbs incandescent, fluorescent and LED put out blue light at about 460nm.
Breaking News!!!! Study shows that being alive increases the chances of death by 100%
In other news: Study shows that repeatedly being bashed with junk science “studies” increases the chances of chronic cynicism by 75%
Another fake “clinical research” article suffering from dissociative cognizance of association is causality belief, even if the findings were at p<0.00001.
If blue light was causing circadian rhythm disturbances without compensation, all marine vertebrata with color vision would have been extinct by now.
Reading small phone/tablet and laptop screens all the time, especially late at night under the blue light, will also cause near sighted vision and over extended time frames, physical damage to the eye anatomy. After awhile, as most could probably concur, it feels like daggers in your eyes after extended hours of reading and browsing the internet especially after a long day. But then, reading small print such as the Bible under candle light for extended periods will also cause similar near vision as generations of our ancestors could attest to.
I must wear blue blockers when using the computer or watching TV. If I don’t my eyes burn and itch like crazy.
Blue light eh? So much for going out to enjoy sunshine.
There is all this blue sky out there giving us cancer.
a small point about the sky I’d like to add – it’s been suggested it’s not blue but cyan 😉
Bung an optical minus blue filter over a lens and you’ll notice the sky does not darken as considerably as one would expect, bang a minus cyan filter over your lens and the sky appears black as the cyan blocked leaves little else in the spectrum.
I really am curious about the blue light claims though – more from an academic perspective than hype of ‘oh noes cancer because, science’
I have doubts about the cancer connection, but blue light is definitely annoying to me, especially at night. The blue car headlights often seen nowadays are dangerous (blinding) at night IMO.
The blinding blue LED headlights are great, if you are the one driving with them. But, if you blind the oncoming traffic and they head on crash into you, I don’t see much benefit unless you want to die. I don’t know how those things are legal, especially in high beam mode. Definitely a huge liability, especially driving in snow and ice when reflection is amplified. Literally blind for those few seconds while passing, and if a convey of semi trucks are approaching one after another on a two lane road with these blue LED’s, you are essentially blind for that duration. I wear a pair of sunglasses on my head that I can drop so as I can try and stay on the road, but essentially now, I try not to drive at night because of this. How did the DOT make these things legal?
You’re right about the DOT — most ANYONE knows red light is less strenuous on your night-vision. Yellow headlights (as they had always been in the past) are acceptable, tho even those might be “reddened” slightly to lessen effects on oncoming drivers. Blue headlights go in the WRONG direction.
France used to, and still may, use yellow lights for auto night driving.
The headlights are terrible if they are behind you. I once drove for a few miles with those things shining into my rearview mirror. I was trying to slouch or sit really straight to avoid the reflection, but no such luck. I actually had trouble seeing in front of me because of the way the light was shining and reflecting – even though it was coming from BEHIND me.
I was about ready to pull over onto the non-existent shoulder and let the car pass, when he finally turned onto another road.
Wear amber driving/shooting glasses. Improves vision with or without the LED lights.
Oh, I am so with you on those damned blue headlights! They are a definite hazard for oncoming drivers.
Guess I’ll have to hang out in the red light district instead.
“It would also be important to do this kind of research in young people that extensively use blue light emitting screens”
I thought screens emitted whatever color was in the image being displayed?
IARC = junk science. They also believe themselves to be above any criticism or even inquiry.
With respect to the referenced study, it has just about everything wrong with it methodologically. But you need go no further than the subjects enrolled in the study were aged 20 to 85… that is born as early as in the 1920s! And they think we should buy a correlation of cancers with often long development times to a snapshot of light taken from space in 2012?
Reader’s Digest version …… everything associated with humans is bad for humans. Get over it. You’re a pox on humanity until you die.