Blue/white Led's Will Kill You.

Postby stiffeeslicker on Wed 22/Jun/11 9:35pm

Was sifting around the interwebby trying to find an answer to the annoying question of why I can never focus on blue Christmas tree lights/blue police lights etc. and found this interesting article:

http://texyt.com/bright+blue+leds+annoy ... alth+risks

Found it pretty interesting RE the popularity of LED bike lights - if you read it all it seems our super-powerful LED bike lights with their mega blue light component are doing our (and anyone we meet)'s vision/health no favours whatsoever. Discuss :D
stiffeeslicker
User avatar
"Intentional, apparently."
Member for: 8 years 2 months

Re: Blue/white Led's Will Kill You.

Postby Mickyfinn on Wed 22/Jun/11 9:39pm

A typical example of why cannibis is illegal
Mickyfinn
Member for: 7 years 8 months

Re: Blue/white Led's Will Kill You.

Postby danose on Wed 22/Jun/11 9:43pm

stiffeeslicker wrote:Was sifting around the interwebby trying to find an answer to the annoying question of why I can never focus on blue Christmas tree lights/blue police lights etc. and found this interesting article: D


big diff between a blue (single frequency) and white (all frequency) led
danose
User avatar
"I've never met a hill I didn't like"
Member for: 13 years 4 months

Re: Blue/white Led's Will Kill You.

Postby stiffeeslicker on Wed 22/Jun/11 9:53pm

Ah but white LED's are (according to article) blue LED's with a phosphor filter - so still have a strong blue component (fairly obvious when you look at one really)
On a similar note I am wondering whether this was a cause of a bout of insomnia I had when I had a computer with a bright blue power LED on in my room...
stiffeeslicker
User avatar
"Intentional, apparently."
Member for: 8 years 2 months

Re: Blue/white Led's Will Kill You.

Postby happybaboon on Wed 22/Jun/11 10:32pm

I'm more worried about the threats posed to my health by chemtrails.
happybaboon
User avatar
"Proud owner of vorb's largest"
Member for: 15 years 8 months

Re: Blue/white Led's Will Kill You.

Postby slidecontrol on Wed 22/Jun/11 10:38pm

HAARP concerns me more
slidecontrol
User avatar
"YOLO = carpe diem for idiots"
Member for: 10 years 6 months

Re: Blue/white Led's Will Kill You.

Postby Wobbler on Wed 22/Jun/11 10:47pm

I've seen a different version of the graph a little way down showing the relative gnarlyness of certain blue LEDs relative to other shit, the difference was a lot larger than even that graph would indicate. Photobiological safety of LEDs is going to become a larger issue that it is now, there is a lot of development of standards and test methods around it happening.
Wobbler
User avatar
Member for: 11 years 11 months

Re: Blue/white Led's Will Kill You.

Postby Simonius_Titius on Thu 23/Jun/11 4:40am

That is a whole lot of information.
I know a bit about vision and LEDs and sleep cycles since mine are so extensively rooted. The article is surprisingly accurate considering it was written by a non-specialist author. This is not new or wacky stuff.

Amazingly, nonvisual daylight detectors in the eye were only identified a few years ago.


I have a custom colour profile for my PC screen, and switch to that after sundown. It has a dimmer red, even dimmer green, and almost no blue. It is surprising how OK it looks - we have a huge ability to compensate for colour casts. I still use CFL bulbs but have incandescents in the study.

This spectrum is said to be from a CREE Fenix P1D CE white LED. Others I have seen had a very much more prominent blue peak.
Image
Simonius_Titius
User avatar
"The truth will set you free. But first, it will piss you off. - Gloria Steinem"
Member for: 8 years 0 months

Re: Blue/white Led's Will Kill You.

Postby neels on Thu 23/Jun/11 10:08am

So blue/white led's are noticeable and annoying.

Excellent, can only increase my chances of being seen.
neels
User avatar
"I've got opinions, that don't make any sense"
Member for: 10 years 1 month

Re: Blue/white Led's Will Kill You.

Postby pissface on Thu 23/Jun/11 10:23am

Simonius_Titius wrote:I have a custom colour profile for my PC screen, and switch to that after sundown. It has a dimmer red, even dimmer green, and almost no blue. It is surprising how OK it looks - we have a huge ability to compensate for colour casts. I still use CFL bulbs but have incandescents in the study.


there is also software called f.lux which does this according to a timetable based on your timezone.

http://stereopsis.com/flux/

i have used it for a short while, i quite like it
pissface
User avatar
"Boneshaker"
Member for: 14 years 8 months

Re: Blue/white Led's Will Kill You.

Postby danose on Thu 23/Jun/11 10:40am

Simonius_Titius wrote:I still use CFL bulbs but have incandescents in the study.


if you shop around (try a proper lighting place like rexel as opposed to whatever random cheap junk your supermarket has) it's quite easy to get CFLs with different colour temps. I've got 'warm' ones in our lounge/bedroom that are actually warmer than an incandescent even - only downside is they're quite slow to warm up ('blue/daylight' cfls start quicker due to the different phosphors - I use them in our bathroom/kitchen where you want 'bright' light and don't mind the harshness)

same with LEDs - early 'white' leds were very blue tinged (and stiffeeslicker - most of the early ones are actually emitting non-visible UV and using tricky phosphors to re-emit in the visible) - again as the tech has advanced this is no longer the case (if I fire up an old luxeon next to a xr-e/xp-g the luxeon looks REALLY blue).

as for people who are scared that blue light is bad for you - so I presume these people never go outside on a nice sunny cloudless day? :crazy:
danose
User avatar
"I've never met a hill I didn't like"
Member for: 13 years 4 months

Re: Blue/white Led's Will Kill You.

Postby Simonius_Titius on Thu 23/Jun/11 4:17pm

Blue is great during daytime but can upset sleep cycles if viewed too late at night.

Our retinas have sensors for red, green, blue, night vision, and a 5th kind which is not involved in vision but which is used purely to set the circadian rhythm. Totally blind since birth people still have these sensors, which are sensitive to a narrow band of blue. The sensor cells were seen yonks ago but their function was only discovered recently, within the last decade I think.

Anyone having sleep cycle trouble is advised to stare at the sky for a wee bit at the normal wakeup time to sync their body clock. Teenagers are very prone to have a natural cycle well over 24 hours so can find it particularly helpful to resync themselves in this way.

We have a body temperature minimum a while (an hour?) before waking , and seeing blue before that time can screw your clock badly. People who have to get up before their temperature minimum sometimes find it helps to wear yellow glasses until their normal wakeup time, or at least until after their minimum if they are going to be getting up early for a while.
Simonius_Titius
User avatar
"The truth will set you free. But first, it will piss you off. - Gloria Steinem"
Member for: 8 years 0 months

Re: Blue/white Led's Will Kill You.

Postby Simonius_Titius on Thu 23/Jun/11 4:39pm

pissface wrote:
Simonius_Titius wrote:I have a custom colour profile for my PC screen, and switch to that after sundown. ...

there is also software called f.lux which does this according to a timetable based on your timezone.
http://stereopsis.com/flux/
i have used it for a short while, i quite like it

Thanks, I just downloaded it. It looks very nice, it can even fade in the change over an hour so you hardly notice. This would also be great for laptops which get used outside, to turn them down at night.
F.Lux provides a link to Google maps to get your location coordinates. For Chch just copy these coordinates:
43S, 172E
Simonius_Titius
User avatar
"The truth will set you free. But first, it will piss you off. - Gloria Steinem"
Member for: 8 years 0 months

Re: Blue/white Led's Will Kill You.

Postby Percy Pig on Thu 23/Jun/11 4:43pm

Simonius_Titius wrote:Blue is great during daytime but can upset sleep cycles if viewed too late at night.

Our retinas have sensors for red, green, blue, night vision, and a 5th kind which is not involved in vision but which is used purely to set the circadian rhythm. Totally blind since birth people still have these sensors, which are sensitive to a narrow band of blue. The sensor cells were seen yonks ago but their function was only discovered recently, within the last decade I think.

Anyone having sleep cycle trouble is advised to stare at the sky for a wee bit at the normal wakeup time to sync their body clock. Teenagers are very prone to have a natural cycle well over 24 hours so can find it particularly helpful to resync themselves in this way.

We have a body temperature minimum a while (an hour?) before waking , and seeing blue before that time can screw your clock badly. People who have to get up before their temperature minimum sometimes find it helps to wear yellow glasses until their normal wakeup time, or at least until after their minimum if they are going to be getting up early for a while.

Thats interesting, I might try this changing the monitor gig, see if that helps my messed up sleep cycles! :thumbsup:
Wont help the times I cant sleep cos of my munted spine though. :hmmm:
Percy Pig
User avatar
"Got a bone?"
Member for: 15 years 5 months

Re: Blue/white Led's Will Kill You.

Postby stiffeeslicker on Thu 23/Jun/11 6:58pm

That software is a great idea! Gonna try it. I always have my laptop screen at the dimmest setting, even in day but that still doesn't cure the blue problem. Question, did anybody at microsoft put thought into this when designing the primarily blue/grey interface for the last three editions of Windows?
stiffeeslicker
User avatar
"Intentional, apparently."
Member for: 8 years 2 months

Health | Sifting - Latest Posts

Who is online

40 Users browsing this website: DotBot, Google [Bot], Google Adsense [Bot] and 37 guests

REMEBER TO CLICK THE LINKS WHEN BUYING FROM VORB SUPPORTERS


  • Wiggle
  • Chain Reaction Cycles
  • GT Bicycles
  • Merlin Cycles
  • ProBikeKit
  • Torpedo7
  • Vorb Shop