For sure Neutral and cool white Leds are responsable for melatonine supression and wake up more than others lights types.They should be ban on night.
It’ very bad for healt alter byorithms.There not be any artificial light after Sunset for a good sleep,just Orange monochrome are more tollerate.But you know the buisness of Leds…
The idea that blue light disrupts sleep and/or causes cancer is bogus. I know it’s fun to get off on the statistical stuff, but it’s nonsense. The same people say that Splenda causes cancer. Utter nonsense. More fear-mongering. We humans need an enemy!
There has been plenty of reputable sources that say exposure to blue light at night time increases risk of cancer.
For me, after years of experimenting with ceiling bouncing flashlights at night time, I can confidently say CW keeps me awake and alert much more than WW lights. I currently use the E21A 2200K for ceiling bounce while watching TV before bed and I get sleepy pretty quickly. Using a CW or even NW 4000k light keeps me awake.
This Theory was proposed in 1987 already. Later a study found blind nurses had a smaller chance for breast cancer. It was found, yellow and red light had the least effect on melatonin.
But … is there any country in the world that took measures to protect their nurses? What’s the situation now, 33 years later? And what’s with night shifts in general? What about DST, enforcing artificial light early (e.g. for school students) and, for some, leading to an extended period of daylight when workers and pupils should rather sleep?
Do we, as a society, voluntarily ignore the results?
same here
I use warm lights to relax and cooler lights as worklights
I recently started learning about the use of Red Light for physical therapy … fun stuff!
Not to sound like a shill, but I got (and reviewed 
) a LITOM floor-lamp with brightness and color-temp settings, and its warmest setting is 1800K (!!) touting 99.4% blocking of blue light. I can’t possibly measure that, but I’ll assume it’s correct.
https://www.amazon.com/dp/B089NK1SRV/
Other than wishing it came in white or even brown “woodgrain” as an option, it’s quite nice.
And it has a special breastfeeding mode, for alla youse who are currently lactating. 
Funny, too, I just (re)found my SF31 that I forgot was nicely WW. It might even displace my WW Xeno as my poke-around-at-night light (which always starts in medium).
Very interesting find! 1800K is sweet and my dream temp for night lighting. However, I tested many ultra warm LEDs in the past that had positive DUV and the yellow bothers me. If this is 1800K with a negative DUV, and especially 90+ CRI, it would be the grail light. So far E21A 2000K 90+ CRI is the closest to candle light.
Actually, I was wondering if the WW LEDs were actually PCA instead of WW-1800K. That would certainly take care of the no-blue part, as I don’t know if 1800K has much blue content, and if so, how much.
Looks interesting. Is there a way to rotate the head it so that it shines at the ceiling and functions more like a torchiere?
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.
Yep, I agree on sugar substitutes.
A lot of people really believe it's dangerous, but not me.
Not gonna say I’m an expert, but I have noticed NO DIFFERENCE WHATSOEVER. And I sleep with an iPad, iPhone, and Mac Book Pro right next to the bed. Plus, a large Samsung smart TV is 12 ft away.
Huh… looks like someone already tried it:
https://www.amazon.com/gp/customer-reviews/RC15BE6VC1E9E/
So, yeah, guess it can be upturned torchiere style.
There’s some of your problem. According to a researchers at UC San Francisco from this article.
“The devices, which emit blue light, have become more common in recent years, and so has insomnia and other sleep disorders…The new study, of US adults, found younger users were on the devices for longer and reported having a more disturbed night’s sleep….Studies also showed hospital patients who read eReaders took longer to fall asleep and had reduced quality of sleep than those who read a traditional book, and those who watch the screens late at night before bed were most affected.”
the truth hurts,when there is giant buisness,but
Amber Narrow Leds are still blue light emitter phosfor converted or a just a direct amber light diode?
I think direct amber
according to this
a native amber LED has no blue output
if someone is using blue light sources
while wearing amber glasses, it maintains melatonin also
it does not matter if no blue is produced (native amber LED), or if blue is filtered out (amber glasses)
as long as no blue and green reaches the eyes, melatonin will not be suppressed
which brings me to headlamps
a red headlamp, or amber, if you prefer, will not suppress melatonin, so will not supress sleep
a green headlamp will suppress melatonin, thereby delaying sleep
a blue headlamp will also interfere with sleep
Years ago in an offset house we used high-cri light bays to assess color. Along came Ott lights and we started using those, as their cri is exemplary. These lights were developed with an eye toward health and are still marketed that way. There have been many studies done on them over the years and I’ll leave it to the individual to poke around and find something to believe, or not. I can’t quantify it, but I feel good around these lights and still use one in my darkroom. If they weren’t so expensive, I would light my whole house with them.
So I’m wondering if the health issues of bluish light are a question of strictly wavelength, or is the quality of the entire spectrum of a particular fixture a factor as well? Schools that install Ottlites have fewer sick days and higher grades, say the studies anyway. These are not led driven, they are gas tube phosphor.
Indeed NBA has no blue output. Most of its output sits at 590nm like low pressure sodium. PCA, or phosphor converted amber, use YAG phosphors to produce yellow light from blue. There is typically less then 8% blue in such chips.
I got no problems. 