blue light associated with prostate and breast cancer

hank · 2020-09-18T19:22:36.000Z

please STOP responding, and especially requoting, their disruptive posts

Amen. Remember, if someone goes back and removes his/her trolling posts, leaving quoted copies of them around is not helpful.

hank · 2020-09-18T19:27:26.000Z

You can look this stuff up.

PubMed

Systematic review of light exposure impact on human circadian rhythm - PubMed

Light is necessary for life, and artificial light improves visual performance and safety, but there is an increasing concern of the potential health and environmental impacts of light. Findings from a number of studies suggest that mistimed light...

Chronobiol Int
2019 Feb;36(2):151-170.
doi: 10.1080/07420528.2018.1527773. Epub 2018 Oct 12.

Systematic review of light exposure impact on human circadian rhythm

… a variety of methods has been applied in individual experimental studies of light-induced circadian impacts, including definition of light exposure and outcomes. Thus, a systematic review is needed to synthesize the results. In addition, a review of the scientific evidence on the impacts of light on circadian rhythm is needed for developing an evaluation method of light pollution, i.e., the negative impacts of artificial light ….

…

a two-hour exposure to blue light (460 nm) in the evening suppresses melatonin, the maximum melatonin-suppressing effect being achieved at the shortest wavelengths (424 nm, violet). The melatonin concentration recovered rather rapidly, within 15 min from cessation of the exposure, suggesting a short-term or simultaneous impact of light exposure on the melatonin secretion. Melatonin secretion and suppression were reduced with age, but the light-induced circadian phase advance was not impaired with age. Light exposure in the evening, at night and in the morning affected the circadian phase of melatonin levels. In addition, even the longest wavelengths (631 nm, red) and intermittent light exposures induced circadian resetting responses, and exposure to low light levels (5-10 lux) at night when sleeping with eyes closed induced a circadian response.

Sari33 · 2020-09-18T19:42:27.000Z

jon_slider:

SKV89:

If the reason for using Amber emitter is to avoid blue light, an E21A 2000K 90CRI would be a good option. It emits minuscule blue wavelength but you still get to see everything in glorious hi fidelity color. It’s a much more practical choice for daily use.

great info!

I think brightness also plays a role. Low lumens means less of whatever percent of blue light might be coming out of an LED.

it would help to have data on the percent of blue light in various LED options at each step in CCT
iow 4000k probably has more blue light percentage than 3000k…

another factor in blue light reception, is the brightness at which the light is used

This is interesting, know the amount of blue light at different power/brightness levels from the same or others Leds and CCT

contactcr · 2020-09-18T21:25:40.000Z

I’m not sure “lumens” is a good measure for this topic. After all, UV is zero lumens but damages your eyes.

Rusty_Joe · 2020-09-18T23:49:14.000Z

It may be the brightness of the LED, I’m convinced (if this is anything). If that is the case, WE ARE ALL SCREWED…but we ain’t changin’ a thang!!!

jon_slider · 2020-09-19T15:15:01.000Z

another Denier Post

watch, now he will answer and continue the denial

total hijacker

nothing on topic to contribute

Deny, Justify, Deny… = troll

Rusty_Joe · 2020-09-19T15:09:33.000Z

jon_slider:

another Denier Post :person_facepalming:

There are just some sacrifices that modern life does not allow us to make. And nothing we can do can offset “light cancer” if indeed it is a thing (e. g. we aren’t going to stop driving due to accidents).

hank · 2020-09-19T18:07:19.000Z

nothing we can do can offset “light cancer”

Wrong. Switching to luminaries that don’t suppress melatonin is an obvious way to reduce the impact.

Google wants to be your friend, you know.

… reduced melatonin production has been reported among night-shift workers [10–12]. Consequently, the suppression of melatonin secretion by exposure to light during nighttime hours is surmised to be the main biological mechanism in the relationship between breast cancer and night work.Feb 6, 2018

The relationship between night work and breast cancer - NCBI

Unheard · 2020-09-19T19:16:31.000Z

“we can’t do anything about…” means just “it’s the way it always was - never change a running system”. Kind of ok from some point of view, but imo we must continuously seek the best solutions. We’re clever humans.

Sari33 · 2020-09-24T12:46:44.000Z

Unheard:

“we can’t do anything about…” means just “it’s the way it always was - never change a running system”. Kind of ok from some point of view, but imo we must continuously seek the best solutions. Were clever humans.

Yes, we are intelligent humans.But we are also 8 billion and some greedy and destructive, where the only goal is accumulate profit.Looking how the pluvial forest has been reduced and the pollution of water,air,earth with this stupid consumerist system and globalizzation
I’m not so optimistic

Rusty_Joe · 2020-09-25T04:49:15.000Z

hank:

nothing we can do can offset “light cancer”

Wrong. Switching to luminaries that don’t suppress melatonin is an obvious way to reduce the impact.

Google wants to be your friend, you know.

Nope. How are you going to get everyone else to not use, say, LED headlights on their vehicles? How about indoor lighting, more “cancer lighting?” You can’t do it, even if you give up your angry blue throwers. You see?

Lightbringer · 2020-09-25T04:56:59.000Z

I can see aftermarket “blue-blocker” filters becoming available to slip over indoor lights, etc.

sochi111 · 2020-09-25T09:04:58.000Z

Would glasses with red lenses count as a good filter?

or is it the other way, you want Blue lense to filter blue light?

Rusty_Joe · 2020-10-02T01:57:56.000Z

The last several nights, I’ve turned my Chromebook, Mac Book Pro, Tablet, and phone on “night mode” and adjusted the sensitivity toward extreme warm. Now, I’m not only adjusted, but I immediately felt the muscles in the back of my eyes relax. No joke.

I don’t yet think that blue light causes cancer, but I’m man enough to admit when I’m wrong. Ocular problems from blue light are, on the other hand, much more believable. What I’m saying is, I’m interested now and want to research this more.

hank · 2020-10-02T02:33:48.000Z

You can’t do it

You can reduce your total exposure. You can wear driving glasses with a blue-blocking tint. You can put a Rosco amber theatrical filter gel over your monitor or television.
And you can choose your own indoor lighting to reduce the exposure to blue-containing light for late evening hours.
You can be aware when your city puts in LED street lighting, for example: europe "blue light" standards - Google Search

Harvard has updated their early review of the issue: Blue light has a dark side - Harvard Health

Lightbringer · 2020-10-02T04:37:48.000Z

I actually kinda miss those 0CRI pinkish merthiolate-colored streetlights from a ways back.

Couldn’t tell blue from green from black…

Unheard · 2020-10-13T19:05:58.000Z

Rusty Joe:

I don’t yet think that blue light causes cancer, but I’m man enough to admit when I’m wrong.

Not sure what causes cancer in nightshifters (if studies are right). Maybe breaking the natural cycle is the culprit, be it melatonin per se or just the missing sleep caused by its supression. But there are quite some studies by now.

No night mode in my old Android devices, but there’s an app. I got so used to it that I never switch it off. My Win10 laptop also is constantly in night mode, but mainly because the display is quite blueish.

Not missing CW.

Sirstinky · 2020-10-13T19:11:02.000Z

wle:

sorry that has to be bogus.

Definitely not bogus. Our bodies are very sensitive to certain wavelengths of light. The study focused on the bluer side of the spectrum, like 6500k and up. It is proven that cooler light can trick our bodies into thinking it’s daytime-which can disrupt our sleep-wake cycle or circadian rhythm, which when that is disrupted causes all kinds of other issues, including systemic ailments. The prevalence of LED streetlights with the cooler light caused issues for drivers (excessive glare and also sleep difficulty) so they had to switch them to warmer light, closer to 4000k and lower. Same with your mobile phone, which emits blue light (especially for LCD’s). Now phones have a mode that makes the screen warmer at certain times. Same with my laptop pc.

wle · 2020-10-14T01:24:51.000Z

i would be highly dubious that a flashlight can make enough blue light, long enough, to make any difference.
or a cell phone screen.

how could that ever be proved?

cell phones and pcs have ‘night mode’ only because
a. it is free and
b. it is also FOM fad of the moment

there
i said it
hmph

wle · 2020-10-14T01:59:48.000Z

wouldn;t THE SUN have 100000 times more ‘blue light’ than any puny screen or flashlight?

wle