blue light associated with prostate and breast cancer

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Theodore41
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xenotar80 wrote:
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.

I think that halogen lights emit large quantities of blue light.
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Theodore41 wrote:
I think that halogen lights emit large quantities of blue light.

Right up into the UV, too.

I still got one of those leak-detecting kits with UV dyes that you can add to oil, coolant, etc. Instead of a UVLED light, there’s a “gun” with 50W halogen bulb behind a silvered-glass filter. Blocks all VIS light and leaves only UV, like a ZWB2 filter.

Of course, I’d use one of my lights vs that beast, but…

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

jon_slider
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Sari33 wrote:
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..

and people, please dont reply to the Blue Light Deniers, they are just hijacking the discussion to talk about splenda.. dont take the bait.

Sari33
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jon_slider wrote:
Sari33 wrote:
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..

and people, please dont reply to the Blue Light Deniers, they are just hijacking the discussion to talk about splenda.. dont take the bait.


These 595nm are phosphor converted or native amber emitters as I need?
jon_slider
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Sari33 wrote:
These 595nm are phosphor converted or native amber emitters as I need?

they look native to me,
you should contact the seller directly with your questions
hank
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Do read the nurses study links, that was quite well done research.

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Lightbringer wrote:
Looks/Feels like a sheathed gooseneck, so it does bend backwards and even tilt/swivel. I’d just do it slowly and carefully, in case there’s any bias to being angled in one direction.
OK, cool. Thanks for letting me know.
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(This post is not directed at anyone in particular)

Hi everyone, thanks for the efforts made thus far to avoid controversies and arguments in this thread. But it does feel like it’s going to start getting ugly. Please try to avoid the more controversial aspects of this topic, and don’t dig in your heels if somebody expresses a different viewpoint. Thanks in advance!

Budget Light Forum ...where Frugal meets with Flashlight!

Sari33
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No word from me about the direct correlation of blue light = disease.
Otherwise we shouldn’t even expose or watch sunlight Wink
But I have personal experience that cool/white lights can affect the sleep cycle more. And that it’s important for regenerate organism and endocrine system.
Remember when in my street replaced HPS bulb for white Leds.
Plus the introduction of cool white headlights on cars/bikes in the opposite lane, how much longer it took me to fall sleep than before. Same sensation of ‘‘wake up’‘ when I watched from afar 5000k Metal Halide instead the almost irrelevant Orange HPS Bulb at similar power.
And not good also watch TV,Phone etc.. before sleep,maybe I’m sensitive.

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Sari33 wrote:
No word from me about the direct correlation of blue light = disease.
Otherwise we shouldn’t even expose or watch sunlight Wink

Yes, I too think it’s about artificial light at night and breaking the natural cycle. Pure luck there are wavelengths not influencing release of melatonin.

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?

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Luckily I’m a good sleeper. I just go to bed usually after watching some tv, computer or phone and I just fell asleep in under 5 mins and woke up when its morning. Only exception is if I need to woke up early or at certain time and then it just seems impossible to fall asleep fast even if thats exactly same time when I normally go to bed.

I know some people even need completely darkness to get a sleep, but that doesnt affect me either.

Sari33
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Unheard wrote:
Sari33 wrote:
No word from me about the direct correlation of blue light = disease.
Otherwise we shouldn’t even expose or watch sunlight Wink

Yes, I too think it’s about artificial light at night and breaking the natural cycle. Pure luck there are wavelengths not influencing release of melatonin.

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?

Oh LoL true,like traffic lights.
The Red made relax then Green wake up to restart you on car.
Anyway can’ t reply to your question sorry!
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Unheard wrote:
Pure luck there are wavelengths not influencing release of melatonin.
melatonin friendly colors, happen to be the colors of fire Smile

Unheard wrote:

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

Sari33
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https://medicalxpress.com/news/2011-09-white-suppresses-body-production-...

That’s why there is boom of melatonin integrator sale

cetary
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Souichirou wrote:

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

Sari33
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jon_slider wrote:
Sari33 wrote:
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.


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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?

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Sari33 wrote:
!{width:70%}https://i.imgur.com/6OboqFA.jpg!

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
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SKV89 wrote:
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.

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cetary wrote:

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 wrote:
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 wrote:
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
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SKV89 wrote:
Sari33 wrote:
!{width:70%}https://i.imgur.com/6OboqFA.jpg!

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
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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 wrote:
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 wrote:
in my opinion

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

Sari33 wrote:
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.

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cetary wrote:
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 wrote:
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 wrote:
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.

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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

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Souichirou wrote:
Guessing reading and comprehension isn’t in your wheelhouse
Souichirou!
stop trolling, insulting, hijacking, and arguing

cetary wrote:
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
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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
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You can look this stuff up.

https://pubmed.ncbi.nlm.nih.gov/30311830/

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

Quote:

… 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
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jon_slider wrote:
SKV89 wrote:
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

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