Blue light is very, very bad.

If thereā€™s gonna be a war, Iā€™m picking a side.

Synthpop >>> Disco

I was a D.R.E.A.D. Gold Card carrying member (DREAD=Detroit Rockers Engaged in the Abolition of Disco).

Disco still sucks Tony, Kick Ball Kick Ballā€¦Trans-Am :smiley:

Wowā€¦ Iā€™m, like, back in high-school again.

It depend how you want discuss the topic.
If you like sarcasm,ok Boss :beer:

Try photography, the light just after sunset is called the blue hour for a reason.

Good observation! :+1: :+1:

These kinds of articles are so misleading especially for the vast majority of the population that donā€™t apply critical thinking to what they read.

Btw, I really need to thank this post. For the past few days Iā€™ve been wondering why my eyes were strained so bad in the evening. Then this post popped up and triggered me to check my night light settings on my PC and thatā€™s when I realized a recent update caused the night light to reset to off. I just turned nigh light back on and my eye strain is gone pretty much immediately! For those affected by eye strain in the evening, try turning on nigh light or night shift. It really works! Blue light really is bad in the evening!

https://www.ledsmagazine.com/leds-ssl-design/article/16695634/bluefree-white-light-breaks-the-paradigm-of-circadian-lighting-magazine
Another article That explain how high peak of Blue present
on many emitters(also warm and neutral) make inhibition of melatonine and
then sleep problems on night when Leds are more usedā€¦

Yep. But remember the free market in ideas is at work. Industry finds it far more profitable to produce blue-white emitting LEDs than to go to the trouble of designing and producing those same basic emitters with a complex and pricey phosphor coating to intercept that blue and make the output warmer. Same reasoning works for flashlight makers ā€” cool blue-white is cheaper.

Not to mention the market disruption that will be caused when those basic blue-white emitting products are displaced by the newer violet-emitting LEDs. Thereā€™s a real scramble going on to fight against the medical advice.

So we are getting more violet light to avoid blue light? sound like its a good idea leading to a possible worst situation. UV is the worst for retina.

Violet (which is above 400nm) is visible light, although it takes a whole lot of it to trigger the visual perception of light.

Look at the chart, human vision is (slightly) sensitive down as far as 400nm

That may be the increasingly yellow lens that goes with aging, blocking the shorter wavelengths.

Fortunately LEDs are narrow bandwith light sources, so itā€™s possible to pick an emitter within the violet (above 400 nm) but outside the also narrow range of blue
{peaks in the blue portion of the light spectrum around 460 nm, most effective in the range between 446 and 477 nm}
that affects the human blue receptor.

Yeah, violet photons are going to pack more energy than blue, somewhat less than UV, and Iā€™d clearly want them completely absorbed by the phosphor, not leaking out the sides of the emitter the way we see making blue rings around yellow hotspots in flashlight beams.

Youā€™re quite right to suspect there may be serious problems when people start hyping ā€œno blueā€ or ā€œretina safeā€ violet-pumped emitters without close attention to the wavelengths. New problems, that is.
A great experiment is underway ā€¦.

Any photon from somewhere in the far blue on to higher energies can knock electrons off of molecules, which is not healthy.

Personally I think violet light is even more harmful to our eyes than blue despite I donā€™t have any scientific evidence to prove it. Violent is a shorter wavelength and higher energy than blue. I would love for someone to prove my assumption wrong but unless there is solid evidence proving violet is less harmful than blue, I will take blue over violet for day-to-day ambient lighting.

PS, found with ā€™oogle:

I will back to incandescent on night use.
Sleep is important for healt.

The E21A 2000K produces less blue wavelengths than even incandescents. I leave it on as nightlight in my kidsā€™ room

2000k is the same of Sodium High pressure bulb,they was very pleasant for eyes,with golden beam but low cri
There was a thousand on my city streets and now are replace with crappy cool white ledsā€¦
what a disgrace

Sorry this is in french : https://www.anses.fr/fr/system/files/AP2014SA0253Ra.pdf

There is a phototoxicity of the blue light for human retina and the part of the blue light that is studied for this toxicity goes from 450 to 470 nm.
The part of the blue light that is studied to affect circadian rhythms goes from 480 to 490 nm.

This phototoxicity is due to a chemical reaction on human eye tissues activated by the blue light (450 to 470 nm).

There are a tons more details about it that I wonā€™t go into because of my broken english.

Which is good because as you may know, the younger you are, the more affected you are. With ages eyeā€™s cystalline lens ā€œdeteriorateā€ and act as a filter that blocks more of the blue light than where you were younger.

Roses are red
Violets are blue
Whichever light is more harmful
I know that life is killing me too

Cree now produces their XP-G3 in a 70 CRI 2200K format. I find that to be particularly interesting as the typical CRI for street lights is 70. 70 CRI at 2200K would be too low for interior usage. Further, I believe the XP-G3 is also an emitter built for and used in street lighting. I have reason to believe that they could be used in something like the RSW series which would be really interesting to see 2200K LED street lights. Color should look superficially similar to SON Deluxe/Super HPS. We are beginning to see the sub-3000K become more and more viable especially after Phoenixā€™s refit of all 2700K. Those lights look superficially like incandescent light.

Same here, we are in a rented small house in the middle of a nature reserve for a few days, and my home-made lantern with 2000K E21A is my sonā€™s nightlight.

Personally Iā€™m not a great blue peak worrier, but I do welcome the ā€œhuman centric lightingā€ shift of the industry, if not for health reasons, it will make lighting so much more pleasant. :slight_smile:

Itā€™s really bad to see public and private places where was nice warm light replaced with low quality Leds