https://www.telegraph.co.uk/science/2018/04/26/new-led-streetlights-may-...
“New LED streetlights may double cancer risk
…analysis of more than 4,000 people living in 11 separate regions of Spain established a link between heavy exposure to the LED lighting and a doubling of the risk of prostate cancer, as well as a 1.5-times higher chance of breast cancer.
…
the “blue light” emitted by the LEDs may be disrupting the body’s circadian rhythm, which in turn affects hormone levels.
Both breast and prostate cancers are hormone-related.
…
The research team at the University of Exeter and the Barcelona Institute for Global Health said their findings may also implicate the nighttime use of mobile phones and tablets, which also emit blue light, in cancer development.
…
blue-spectrum light decreases the production and secretion of the melatonin hormone.”
another source of the study details
https://ehp.niehs.nih.gov/ehp1837/
fwiw, my iPhone has a NightShift feature that shifts the White Balance to Warm after sunset. My iMac does also.
based on this reading, I will continue to avoid Cool White lighting after sunset, I find Warm White much more relaxing, after dark.
My house lighting is incandescent.
Well. This is interesting.
I have done some research on light and sound frequency effects on cells etc. There is a ton to be found online. Now you got me thinking again. Oh boy.
Actually blue light has been known to be carcinogenic and affect sleeping for many years already. This is the same reason why Samsung, Apple, and others have added a Blue Light Filter feature to their phones that makes the colors warmer (less cool/blue) so it causes less harm to your eyes, health, and ability to sleep. There’s also a popular program for your PC called f.lux that makes the colors warmer at night time and colder in the day time, which I installed on my PC. It works great.
That’s why for me I only use 4000k or lower for my night time EDCs.
so imagine a LEO and he is using a CW light for Duty at night. does this matter too?
thanks.
Elzetta Bones.
In standarized world there is a term: photobiological safety. Light can have many effects on human body. strenght, wavelenght, PWMs – these all take effect on us.
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thanks so I am wondering then if it just best to take cool white out of equation when on duty at night and use neutral warm .
?.
cheers…
Elzetta Bones.
Man, I wish my knowledge allow me to give you the right answer. But it does not and since we’re talking about human safety (safety always 1st) I do not dare to answer. But I’m nearly sure some requirements (made upon research) are given in occupational hearth and safety guidelines. (OSHA?)
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I thought windows 10 already came stock with the night light filter feature? Pretty much never used them as I kinda sleep early anyway
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“Normal humans don’t go around killing people and burning towns!”
“Don’t worry. I’ll go with you! So you just follow me and no arguing, okay?”
sorry that has to be bogus.
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It never gets easy, you just go faster. -Greg Lemond.
,ø¤º°`°º¤ø¸,ø¤º°`°º¤ø¸,ø¤º°`°º¤ø¸
Hmmmm…so even if color temp is lower, is it possible for hidden blue to be in there?
there is blue light in sunlight… is that causing all these symptoms?
wle
"You never have the wind with you - it's either against you, or you're having a good day."
Daniel Behrman, "The Man Who Loved Bicycles".
It never gets easy, you just go faster. -Greg Lemond.
,ø¤º°`°º¤ø¸,ø¤º°`°º¤ø¸,ø¤º°`°º¤ø¸
Hmmmm….. I do not pretend to understand either side of this. But it seems not all Blue Light is bad??
Blue-light therapy warding off skin cancer
Blue Light Therapy: Uses and Side Effects – Healthline
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My understanding is that blue light specifically is the type of light that impacts the sleep cycle, as opposed to red or green. And for this reason, warmer/cooler CCT lights have different effects. I've easily observed this in my own life: one room of my house has 2700K lighting, and I will fall asleep if I try to read a book in that room. The other areas of my home have 4000K to 5000K lighting, and I have no issues reading and staying awake there.
Anyway, this becomes an issue when significant blue-light invades spaces where it hasn't always been. Cool-CCT streetlights in particular could be an issue, as they shine at night. If people aren't aware of the impacts of blue light on their sleep schedules and/or don't accommodate for that impact in their life, they'll have sleep cycle disruptions. This can range anywhere from decreased quality of sleep to straight-up insomnia. In fact, I had seen studies showing this impact comparing dark vs. brightly lit neighborhoods already (wish I still had that source), and I'm not surprised at all that adding more blue light would strengthen the effect.
My answer is to move into my warmly lit room at the end of the day and wind down there. Also to limit screen usage and/or blue-light filter the screen. And lastly, blackout curtains
TL;DR: It's long been known that light affects sleep, more blue spectrum means stronger impact, and sleep impacts everything else
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so how long is the effect supposed to last?
how strong and how blue does it have to be, to remove X minutes of sleep?
wle
"You never have the wind with you - it's either against you, or you're having a good day."
Daniel Behrman, "The Man Who Loved Bicycles".
It never gets easy, you just go faster. -Greg Lemond.
,ø¤º°`°º¤ø¸,ø¤º°`°º¤ø¸,ø¤º°`°º¤ø¸
The liberal use of the word “may” negates the declaration of a scientific conclusion. H2O “may” be lethal… Circumstances dictate how lethal.
It’s like a magic cancer-wand. Point it at a bad guy and bam! Dude dies of cancer, and doesn’t even get to die in his sleep. Teaches him right for lurking around an alley in the dark.
I knew there was a reason why I kept all those crappy LED maglites.
I thought using a cool white for not so long on and off during a night duty LEO shift would be ok as It wasn’t excessive.
not sure, maybe best stick to NW/ Warm
Elzetta Bones.
For those concerned and using firefox, opera or chrome without a built in color temp changer, this add on is very handy. It’s not automatic, but just leaving it on all the time isn’t that bad either.
https://mybrowseraddon.com/screen-color-temperature.html
The quotes from the article seem to answer a lot of the questions here. The issue is constant, bright, high-CCT street lighting being linked to changes in sleep patterns/hormones.
Maybe I’ll show you some example – from photobiological safety point of view.
The main issue here is a blue light spike at 430-440nm – it’s caused by a phosphor coating quality and phosphor’s mix.
As you can see not only CCT matters, the 4000K cannot be named “safe” or “safer” sorry SKV89 ;).
Enlightened member of pl.rec.rowery
Light-Test.info – bike light’s & Headlamps comparison site. – In polish but picture says everything
I would think it’s a combination of factors that link this all together. IMO it’s mostly to do with ones lifestyle. If you’re up late regularly chances are you could be in the presence of bright light which further interrupts the sleep cycle.
http://www.center4research.org/women-work-night-shifts-higher-risk-devel...
At the bottom of the first paragraph “Researchers found that night shift work links to breast cancer because it can change a person’s sleep-wake cycle. This has a lot to do with artificial light.”
AsI recall, it takes only a brief exposure — think incandescent white nightlight bulb — to suppress melatonin production. Then it takes half an hour to an hour for the body to resume produccing melatonin. It’s the melatonin that suppresses breast cancer (which is why night shift workers and people in areas newly supplied with nighttime electricity show an increase)
https://www.google.com/search?client=firefox-b-1-d&channel=tus&q=melaton...
https://www.health.harvard.edu/staying-healthy/blue-light-has-a-dark-side
You can buy a spectrometer kit (several variations, varying prices) from PublicLab.
https://store.publiclab.org/collections/bulk/products/lego-spectrometer-...
EDIT
Here’s the spectrum from one of the claimed low-blue-light 110v bulbs
See http://budgetlightforum.com/comment/1528412#comment-1528412 from DominikM for spectra
I used my kit spectrometer to check the claims of bluelight suppression. A lot of it is hype — f.lux for example changes the apparent color temperature by adding more red, rather than removing blue. The spectrometer shows plenty of blue light still being emitted from the computer screen (whether fluorescent or LED lit).
I swapped amber LEDs into half our home flashlights, for nighttime use, and for room lighting we use amber LED bulbs or “bug light” compact fluorescents for evening light during the short-day half of the year.
Doing that cured our insomnia, which had gotten bad when we replaced all our incandescents with “white” compact fluorescents some years ago.
I think CCT is actually still a huge part of what’s happening there. Even 2700K light from a blackbody source will have far less of the blue end of the spectrum compared to 4000K.
https://curiosity.com/topics/this-is-how-little-blue-light-it-takes-to-d...
has several links including this one: https://www.lrc.rpi.edu/resources/newsroom/pdf/2010/CircadianLight_8511.pdf
Yep.
It’s what matters.
4000k is better, 3000k is even better, 2700k is even better than 3000k, and 2000-2200k has almost no blue light.
I’d love to test 1800k LEDs myself.
Could someone use Luminus 3030 Cubes in Virence’s large MCPCB?
My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547
The N219b has that large blue spike, yet it is sold as photobiologically safe:
I want to learn more about how to determine the RG0 Blue Light safety requirement.
do High CRI LEDs score better than Low CRI?
does low Color Temperature score better?
etc
“Photobiologically safe: exempted from bluelight hazard” sounds like marketing hype to me.
But apparently it’s referring to a European regulation.
https://www.ledsmagazine.com/manufacturing-services-testing/standards/ar...
The “blue light hazard”
https://www.google.com/search?client=firefox-b-1-d&channel=tus&q=%E2%80%... is damage to the eye, perhaps the claim is this emitter is not strong enough for that problem to arise.
https://www.google.com/search?client=firefox-b-1-d&channel=tus&q=Photobi...
A few years ago I corresponded with one of the researchers in the field, who said that at a European scientific conference on the subject they were already seeing industry PR people there to deny any possible problem with the blue-white LEDs their companies were pushing as “so cheap they pay for themselves in saved electricity costs” —- too cheap to meter, basically.
LOLOLOL You’re right. When they use words like “ exempt from bluelight hazard” it sounds more like bureaucratic BS than scientific fact.
https://www.ncbi.nlm.nih.gov/pubmed/24487866
Opt Lett. 2014 Feb 1;39(3):563-6. doi: 10.1364/OL.39.000563.
Phosphor-converted LEDs with low circadian action for outdoor lighting.
https://www.ncbi.nlm.nih.gov/pubmed/21600300
This is the main reason I want most of my flashlights in 2000K or below. Blue light affects my sleep at night, so keeping my flashlights at 2000K won’t give me any melatonin suppression. All my lights in the house are halogen and i cover up all sources of LEDs with red or black tape. 2000K is a little spooky sometimes though since the color temp looks like a candle flame, so i have a bunch of 2700K flashlights on hand too… just an excuse for more flashlights.
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