blue light associated with prostate and breast cancer

jon_slider · 2020-09-16T20:14:05.000Z

Unheard:

Pure luck there are wavelengths not influencing release of melatonin.

melatonin friendly colors, happen to be the colors of fire

Unheard:

What I don’t understand: Green is supposed to supress melatonin, right? When we watch yellow light, both red and green receptors are stimulated (else we wouldn’t see yellow), so the effect has nothing to do with receptors, or am I wrong somewhere?

so are you asking if Yellow light suppresses melatonin? I think yes.

Unheard · 2020-09-16T20:25:47.000Z

I’ve read it doesn’t but I wouldn’t wonder if I mixed something up again.

Sari33 · 2020-09-17T08:40:44.000Z

medicalxpress.com

'White' light suppresses the body's production of melatonin

Exposure to the light of white LED bulbs, it turns out, suppresses melatonin 5 times more than exposure to the light of High Pressure Sodium bulbs that give off an orange-yellow light. "Just as there are regulations and standards for 'classic'...

That’s why there is boom of melatonin integrator sale

cetary · 2020-09-17T00:25:36.000Z

Souichirou:

Ehh I did shiftwork in hospitals where the lights were pretty much all 6500k~ or higher and still slept like a baby after shifts within 30~ mins of getting home so did my co-workers hell even during shift we would get sleepy under fluorescent lights….

Also the dailymail is hardly a credible source to cite from as the site itself doesn’t have citations to where their information was pulled from or what study…….

The people you working with were most likely so tired they probably near the verge of falling asleep on shift. As others have mentioned, if you’re so tired, you can easily fall asleep in the middle of the day.

Here’s more evidence from U.C. Davis

“Continued exposure to blue light over time could damage retinal cells and cause vision problems such as age-related macular degeneration. It can also contribute to cataracts, eye cancer and growths on the clear covering over the white part of the eye…Exposure to blue light before bedtime also can disrupt sleep patterns because it affects when our bodies create melatonin.”

And more from U.C. San Francisco. This is the research the dailymail used, so it isn’t the daily mail saying this. Although their reporting may be a bit sloppy; the meat of the issue and research is still there.

“Smartphone use directly correlates with sleep, with greater use demonstrating a significant association with shorter sleep duration and worse sleep efficiency, according to researchers at UC San Francisco…This was the first study to examine such use in a broad population, directly measuring screen time rather than relying on self-reported use. And, those with more screen time use had poorer sleep…”

Theodore41 · 2020-09-17T05:04:49.000Z

Galaxy Note 9,has a filter to minimize blue light.

Sari33 · 2020-09-18T19:17:15.000Z

jon_slider:

Sari33:

These NBA are interesting for this specific use.But CRI would be very low.
Where we can get on 3535… size?

this has nothing to do with CRI
you can get red in 660 and 730nm, plus green 520nm and
Amber 595nm all from kaidomain.

I already got amber xp-e Led (not from KD) ~1$.
Placed by myself on single mode sk68.
Be aware the real color to my eyes look more washed
and less saturated than photo.
Don’t like,I would try another more deep Orange native if it exists.

Rusty_Joe · 2020-09-18T15:34:47.000Z

Let’s be honest; are we REALLY willing to give all CW emitters? And what if it turns out that ALL artificial light has the same effect? What constitutes non-“blue” light? How WARM does it need to be?

SKV89 · 2020-09-18T15:52:25.000Z

Sari33:

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.

jon_slider · 2020-09-18T16:17:37.000Z

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

even a cool white LED, used at sublumen levels, moreso at scotopic levels (below 0.01 lumens, when we cant see colors), would be producing blue light in very low quantities…

makes me wonder if below a certain lumen level, even cool white can be used without degrading Rhodopsin…, and also without degrading Melatonin?

blue light factors to quantify
intensity (more lumens means more blue light)
spectrum (higher Color Temperature means more blue light)

reactions to monitor
Rhodopsin (more blue light means less of that hormone)
Melatonin (more blue light means less of that hormone)

.

What benefits make some people want Amber?
We know Red is better at preserving Rhodopsin and Melatonin.

Souichirou · 2020-09-18T16:31:02.000Z

cetary:

The people you working with were most likely so tired they probably near the verge of falling asleep on shift. As others have mentioned, if you’re so tired, you can easily fall asleep in the middle of the day.

Cant speak on the sleeping habit’s of co-workers but I get a solid 7-8 hours of sleep on the daily.

cetary:

Here’s more evidence from U.C. Davis

“Continued exposure to blue light over time could damage retinal cells and cause vision problems such as age-related macular degeneration. It can also contribute to cataracts, eye cancer and growths on the clear covering over the white part of the eye…Exposure to blue light before bedtime also can disrupt sleep patterns because it affects when our bodies create melatonin.”

Keywords “could” and “can”. I mean there is extensive data and studies connecting the relationship between radiation and cancer is well documented, exposure to radioactivity/radioactive materials increases your chance of developing cancer. Bananas contain potassium-40 which is a radioactive isotope, which technically makes them radioactive…… Brazil nuts are technically in a sense a “super food” and have many health benefits yet contains selenium and radium isotopes which can lead to symptoms much like radiation poisoning….

cetary:

And more from U.C. San Francisco. This is the research the dailymail used, so it isn’t the daily mail saying this. Although their reporting may be a bit sloppy; the meat of the issue and research is still there.

“Smartphone use directly correlates with sleep, with greater use demonstrating a significant association with shorter sleep duration and worse sleep efficiency, according to researchers at UC San Francisco…This was the first study to examine such use in a broad population, directly measuring screen time rather than relying on self-reported use. And, those with more screen time use had poorer sleep…”

Still the “Focus” of the study in it of itself is flawed in my opinion…. based on just the RAW total time in front of a “phone” is only about an hour a day~ given if their numbers are accurate, that is far FAR less than the average exposure to “blue light” in front of a TV or monitor for 5-10 times the amount of time daily with a phone due to job obligations OR leisure time…. you can’t really be pushing the narrative that around an hour of phone use daily/3.7 minutes per hour during the day would have affects far exceeding 5-10 hours “blue light exposure from a TV/monitor….

Sari33 · 2020-09-18T16:48:44.000Z

SKV89:

Sari33:

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.

Sure, I know E21A at 2000k are miles better but are hard to find,maybe demand is too low(bad).I would see them on my street Lights…

cetary · 2020-09-18T18:28:20.000Z

Can you give me some peer reviewed resources that say that exposing yourself to large amounts of blue-rich white light at night has no negative impact on melatonin and leptin? Otherwise, this is pedantic…

Souichirou:

I mean there is extensive data and studies connecting the relationship between radiation and cancer is well documented, exposure to radioactivity/radioactive materials increases your chance of developing cancer. Bananas contain potassium-40 which is a radioactive isotope, which technically makes them radioactive….

Souichirou:

in my opinion

You’re free to your opinions and experiences, but I still want peer reviewed research.

Sari33:

Sure, I know E21A at 2000k are miles better but are hard to find,maybe demand is too low(bad).I would see them on my street Lights…

Intl-outdoor has them in the KR-4 and D4 series as a recently added option. Sofirn is also working on another 2000K E21A light. Regarding street lighting, manufacturers are taking note of the increased demand for warmer toned lights. Schreder Lighting now officially lists 2200K as an option for its street lights which are typically listed under color codes. 2200K would be represented as 722 for 70 CRI 2200K or as 822 for 80 CRI 2200K. They also have amber options as well as 727, 827, and even an 825. U.S. manufacturers are practically falling behind.

Souichirou · 2020-09-18T18:36:13.000Z

cetary:

Can you give me some peer reviewed resources on that say that exposing yourself to large amounts of blue-rich white light at night has no negative impact on melatonin and leptin? Otherwise, this is pedantic….

Guessing reading and comprehension isn’t in your wheelhouse…. I never made claim of such that “large amounts of blue-rich white light at night has no negative impact on melatonin and leptin” I made claim that the volume of it from “Smartphones” is merely a drop in the bucket so to speak in terms of the VOLUME of exposure from TV’s and monitors from a computer and the total TIME of exposure from other sources DWARF the amount indicated in the “study” only mentioning the “smartphone” being the cause is flawed as it was exaggerating the affects while ignoring the fact that screen exposure from “smartphones” in general is smaller than other sources of blue light. But I guess reading my rebuttal and comprehending it are two entirely different concepts to you.

Souichirou:

I mean there is extensive data and studies connecting the relationship between radiation and cancer is well documented, exposure to radioactivity/radioactive materials increases your chance of developing cancer. Bananas contain potassium-40 which is a radioactive isotope, which technically makes them radioactive….

cetary:

Your free to your opinion, but I want peer reviewed research.

You want “peer reviewed research” that exposure to radioactivity/radioactive materials increases your chance of developing cancer ? there are thousands upon thousands of studies that prove this…. Most famous is madame Marie Curie whom died due to prolonged exposure to radioactivity causing her to develop aplastic anemia which can later develop into leukemia.

Sari33 · 2020-09-18T19:14:22.000Z

From personal experience another aspect is the size of the source,.
The LED emits light from a tiny small area, annoying to watch direct the die at 0.1lm,
while looking at a 60W LPS sodium lamp with a large surface does not bother me at all.
The problem of Leds It is that they spread too quickly on the world,often low quality or badly raw installed with the dies not covered with diffuser( look at gardens lights or some public street).Major of peoples buy them without knowing specs or quality like us.
While a bulb incandescence will always be the same whoever does it, at worst it burns out first

jon_slider · 2020-09-18T19:06:00.000Z

Souichirou:

Guessing reading and comprehension isn’t in your wheelhouse

Souichirou!
stop trolling, insulting, hijacking, and arguing

cetary:

wrote:
Your free to your opinion, but I want peer reviewed research.

cetary, I appreciate your rational comment
however
it is wasted on argumentative trolls…
so
please STOP responding, and especially requoting, their disruptive posts

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!!!