blue light associated with prostate and breast cancer

[hank]

If you want to experiment, visit a professional photography or theater lighting store that carries colored filter sheet material.
20 x 24 inches, sheet costs about $7ish. Pricier from Amazon etc.

myColor | Rosco

Ask for a little sampler pack, often given free, with strips of all colors, big enough to cover a 20mm flashlight lens.
You can see the transmission spectrum for each filter type too.

I have a sheet of this one taped so I can flip it over the computer screen in the evening:

[Joshk]

Nobody has suggested just dimming your lights to reduce the blue? I have trouble falling asleep, and recently installed some very dim indirect lighting and began dimming my monitor’s back-light to minimum at night. It has definitely helped. Same ratio of colors, just far less of everything, including blue.

[hank]

Here’s a comparison of the effect on melatonin of ordinary room light (less than 200 lux) compared to dim (less than 3 lux) light:

J Clin Endocrinol Metab. 2011 Mar; 96(3): E463–E472.
Published online 2010 Dec 30. doi: 10.1210/jc.2010-2098
PMCID: PMC3047226
PMID: 21193540
Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens...

[BurningPlayd0h]

@pinkpanda3310

More likely the lack of exercise is the reason which totally gets ignored because it’s too hard.

FYI that’s completely untrue. Reducing caloric intake by even a small amount is equivalent to a huge amount of exercise.

[Bob_McBob]

@Tally-ho

bob_mcbob tested the Nichia 219B in a FW3A, if you look at his TM-30 tests you will see that it has a blue spike.

Here’s the spectrum plot for that light at the ramp ceiling.

[jon_slider]

@pinkpanda3310

who is going to change their lifestyle because of the Blue Light Fear . Turn the house lights down dim in the evenings and don’t look at screens 2-3hrs before sleep.

EDIT- Looking at my last sentence makes me wonder if that has anything to do with the world population growth rate slowing down

I think youre on to something, blue light associated with reduced sex drive… LOL!

or, am I reading something into it that was not there?

[pinkpanda3310 (Pinky)]

@BurningPlayd0h

@pinkpanda3310

More likely the lack of exercise is the reason which totally gets ignored because it’s too hard.

FYI that’s completely untrue. Reducing caloric intake by even a small amount is equivalent to a huge amount of exercise.

You’re missing the point I was trying to make. Let’s delete the exercise part of what I wrote (because obviously it’s too hard :person_facepalming: ) If one is overweight and consuming too much are you going to entirely blame it on the occasional burger and chips???

@jon_slider

… or, am I reading something into it that was not there?

Nope

[teacher]

@BurningPlayd0h

@pinkpanda3310

More likely the lack of exercise is the reason which totally gets ignored because it’s too hard.

FYI that’s completely untrue. Reducing caloric intake by even a small amount is equivalent to a huge amount of exercise.

Please clarify. Are you referring to this in relation to losing weight??

Because as far as I know “reducing caloric intake” has no effect on building cardio strength or the other benefits of exercise.

TIA

[teacher]

How Light affects Melatonin and Sleep

How Light effects Melatonin and Sleep
Posted by Wayne Caswell

You heard me mention color temperature before, and the effect of watching TV or reading on the iPad before bed (See Sleepy Yet? — How Light from Electronics Effects Sleep), but here’s why it’s important.

This WebMD article examines the hormone melatonin, which helps regulate sleep & wake cycles (the circadian clock). Melatonin production in the body is triggered by darkness and inhibited by light, and that explains why we have trouble with jet lag, shift work, and winter months with fewer daylight hours.

This Wikipedia article describes light therapy and melatonin supplements as treatment for sleep disorders like insomnia. It also describes the light color temperature, from the warm yellow of incandescent light bulbs, to blue light of the new fluorescent and LED bulbs, or the bluish tint of the iPad and TV screens.

One way to fool the body into producing melatonin earlier so you can go to sleep earlier is to select warm-color light bulbs and have them dimmed in the evening. Another way is to wear DARK AMBER or ORANGE sunglasses in the evening to block blue light (short light wavelengths). And of course, that’s why sleep experts advise against using a computer or watching TV shortly before bed.

Because my wife and I often watch TV immediately before bed, and she likes to look at videos of our granddaughter on her iPad then, I checked the iPad Settings and found a way to dim the backlighting intensity and set it to somewhat adjust automatically depending on the ambient light. Go to Settings / Brightness & Wallpaper.

I’d also like the iPad to change the color temperature at night but found nothing native in the iPad, so I searched for a reliable iPad app for that. I found iJetlag and TheSleepApp but was disappointed with both of them. One even used the wrong color of light to encourage melatonin production and encourage sleep.

Additional sources of sleep information include the two articles on this site by PhD sleep consultant Bruce Meleski (Sleep Balance – Your Path to Better Sleep and Brain Entrainment for Better Sleep and Health) and in Jeanie Wolfson’s article on Sleep: Timing of Melatonin, Light, Dark, & Use of Other Aids. Wolfson lists many suggestions for improving sleep, including these few:

• Keep bedroom dark or wear an eye mask.
• Keep room cool and feet warm.
• Find a mattress that works for you, trying harder, softer, coil, foam, gel, waterbed, or hammock.
• Block distracting sounds with white noise.
• Use lighting controls to simulate dawn before alarm sounds.
• Don’t watch TV, use a computer, or do homework within an hour of going to bed.
• Avoid caffeine and snacks that can cause a blood-sugar drop during the night.
• Establish a strict sleep/wake schedule.
• Exercise regularly.

………

My take is some magical CCT of light is not the magic bullet that fixes it all. Light, any light; hinders melatonin production. Darkness promotes melatonin production.

This could be ‘scientifically’ discussed & analyzed probably forever.

But for those of us who are not really that ‘scientific’ maybe there is another way.

• Get plenty of light in the daytime. [or ’your’ daytime if shift working]
• Get some type of exercise.
• Sleep in a DARK place.
• Anything else that ’works for you’.

Yeah, that is simple & not real exciting…. but it has been working for ages.

ymmv
…

edits for spelling corrections

[patmurris]

@Tally-ho

@Scallywag

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.

Yes, this is a known effect which is measured and light sources can be ranked by impact on ipRGC (melanopic function).
See below a list of light sources with different CCT, blue %age and their relative melanopic potential :

(Source)

Thanks for this post.

It’s interesting to see moonlight mentioned. Would this explain full moon associated disorders?
I’ve long been trying to sort out what is ‘real’ and what is just popular belief on that matter without much success.

[pinkpanda3310 (Pinky)]

@patmurris

It’s interesting to see moonlight mentioned. Would this explain full moon associated disorders?

Hehe now you know where the word ‘lunatic’ comes from

[teacher]

Blue Light Is Not the Only Culprit It Seems…
.

.

.
Part of the problem…

[clemence]

So….as I said (somewhere). The root of the problem is all the artificial lights we created, NOT only the blue light.
Use just enough light at night, sleep in the dark, limit night gadgeting.

I’ve seen many under developed villages in my country. Almost complete darkness in the whole village from 18:00 o’clock, no other than wood/kerosene fire at night. When it’s dark they stop their outside activities, sleeping or making babies. Yet their average life expectancy is below 50 y.o. Much lower than in the Canada or US, countries with almost no dark nights. There are more important factors outside blue light hazard.

What’s more concerning is the lights we created outside our buildings. Those light ruin our non human brother and sister.

[Clemence]

[teacher]

@clemence

So….as I said (somewhere). The root of the problem is all the artificial lights we created, NOT only the blue light.
Use just enough light at night, sleep in the dark, limit night gadgeting.

I’ve seen many under developed villages in my country. Almost complete darkness in the whole village from 18:00 o’clock, no other than wood/kerosene fire at night. When it’s dark they stop their outside activities, sleeping or making babies. Yet their average life expectancy is below 50 y.o. Much lower than in the Canada or US, countries with almost no dark nights. There are more important factors outside blue light hazard.

What’s more concerning is the lights we created outside our buildings. Those light ruin our non human brother and sister.

[Clemence]

Personally, I agree with you completely. :+1:

[Scallywag]

@Tally-ho

Yes, this is a known effect which is measured and light sources can be ranked by impact on ipRGC (melanopic function). See below a list of light sources with different CCT, blue %age and their relative melanopic potential : !{width:100%}https://i.imgur.com/9gCxXFX.jpg! (“Source”:https://www.energy.gov/sites/prod/files/2016/11/f34/royer_spectral-power-dist_denver2016.pdf)

Thanks for that chart!

As for the rest of the thread:

Avoid blue light when you go to bed, for a while before bed, and during your "night". Like I said, I have blackout curtains, so despite living near a very brightly, LED-lit area that would otherwise significantly intrude into my home, I receive nearly zero outside light at night.

The biggest thing people should take away from this isn't blue light, but sleep. Sleep is incredibly important, and having a good sleep cycle is critical for your health. Not getting enough good sleep will affect you long-term. There's a lot of studies to support that in a lot of different ways.

[clemence]

@Scallywag

@Tally-ho

Yes, this is a known effect which is measured and light sources can be ranked by impact on ipRGC (melanopic function). See below a list of light sources with different CCT, blue %age and their relative melanopic potential : (Source)

Thanks for that chart!

As for the rest of the thread:

Avoid blue light when you go to bed, for a while before bed, and during your “night”. Like I said, I have blackout curtains, so despite living near a very brightly, LED-lit area that would otherwise significantly intrude into my home, I receive nearly zero outside light at night.

The biggest thing people should take away from this isn’t blue light, but sleep. Sleep is incredibly important, and having a good sleep cycle is critical for your health. Not getting enough good sleep will affect you long-term. There’s a lot of studies to support that in a lot of different ways.

Agree! Without proper sleep you don’t have time to regenerate your broken cells. I wish I could also regenerate my telomeres

[Clemence]

[teacher]

@clemence

@Scallywag

The biggest thing people should take away from this isn’t blue light, but sleep. Sleep is incredibly important, and having a good sleep cycle is critical for your health. Not getting enough good sleep will affect you long-term. There’s a lot of studies to support that in a lot of different ways.

Agree! Without proper sleep you don’t have time to regenerate your broken cells. I wish I could also regenerate my telomeres

[Clemence]

+1 . Quality sleep is essential! . :+1:

As far as “telomeres” go, check out the article below. You probably already know all this…… but it sure can’t hurt.

How to Lengthen Your Telomeres & Unlock the Key to Longevity

[clemence]

Thanks, yup I knew most of the practices but still a useful link for easy sharing

[Clemence]

[teacher]

@clemence

Thanks, yup I knew most of the practices but still a useful link for easy sharing

[Clemence]

Your welcome.

[hank]

To quote the web page of “Doctor” (not a MD) Axe :

All readers/viewers of this content are advised to consult their doctors or qualified health professionals regarding specific health questions.

And an earlier caution:

Be careful about reading health books. You may die of a misprint.

— Mark Twain

Or you may die of alternative medical facts, as Steve Jobs did recently.