White LED Light Harmful - Electrical - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 08-22-2010, 10:38 AM   #1
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

White LED light harmful


Nichia and other LED makers have details on this and on the precautions they take to minimize the damage from certain wavelengths.
This news is at least two years old but it's the first I've heard of it.

Advertisement

Yoyizit is offline   Reply With Quote
Old 08-22-2010, 11:56 AM   #2
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Rewards Points: 2,000
Default

White LED light harmful


there has always been a problem with all types of lights if they produce harmful IR or UV wavelengths. Each lamp type has dealt with the problem at some time in their use. Incandescents can easily be designed to produce IR wavelengths and fluorescents are notorious for producing UV wavelengths. HID lamps are also problematic in the UV range. I see no reason it is not possible to produce wavelengths of light via an LED that would be harmful. That is simply something the engineers have to deal with.

Advertisement

nap is offline   Reply With Quote
Old 08-22-2010, 12:54 PM   #3
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

White LED light harmful


The eye protects itself against the wavelengths and intensities found in sunlight. Apparently white LEDs produce blue light wavelengths at an intensity not found in the spectrum of sunlight and so the eye is fooled, and damaged.

This gets more and more complicated but we can't very well go back to using candles.
Yoyizit is offline   Reply With Quote
Old 08-22-2010, 01:07 PM   #4
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Rewards Points: 2,000
Default

White LED light harmful


Quote:
Yoyizit;489401]The eye protects itself against the wavelengths and intensities found in sunlight.
actually it doesn't. Ever try staring at the sun? Permanent damage can result. Especially during an eclipse the eye fails to protect itself.

Quote:
Apparently white LEDs produce blue light wavelengths at an intensity not found in the spectrum of sunlight and so the eye is fooled, and damaged.
and what wavelength would that be?

Quote:
This gets more and more complicated but we can't very well go back to using candles.
more complicated? for some reason you believe you are the only person to understand light? Tossing out such simplistic statements doesn't allow one to think much of what you are saying or the person saying it.
nap is offline   Reply With Quote
Old 08-22-2010, 01:13 PM   #5
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

White LED light harmful


Quote:
Originally Posted by nap View Post
1 and what wavelength would that be?

2 more complicated?
for some reason
Tossing out
1 440–490 nm
http://en.wikipedia.org/wiki/Blue
2 sorry to bother you.
Yoyizit is offline   Reply With Quote
Old 08-22-2010, 01:18 PM   #6
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,221
Rewards Points: 2,020
Default

White LED light harmful


What I'd worry about more is this:

http://www.wickedlasers.com/lasers/S...ies-96-37.html

Kids who have no idea about laser safety will go buying this pointing it everywhere at random.

You can blind an astronaut in the ISS with that thing. It can also burn your skin.
Red Squirrel is offline   Reply With Quote
Old 08-22-2010, 01:23 PM   #7
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

White LED light harmful


Quote:
Originally Posted by Red Squirrel View Post
What I'd worry about more is this:

http://www.wickedlasers.com/lasers/S...ies-96-37.html

Kids who have no idea about laser safety will go buying this pointing it everywhere at random.

You can blind an astronaut in the ISS with that thing. It can also burn your skin.
"A laser diode is a laser where the active medium is a semiconductor similar to that found in a light-emitting diode. "

I guess the Army could use these to blind the enemy but that makes for bad press. Better to use microwaves to give them 1st & 2nd degree burns with only a minimal number of blindness cases.
Yoyizit is offline   Reply With Quote
Old 08-22-2010, 01:31 PM   #8
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Rewards Points: 2,000
Default

White LED light harmful


sunlight ranges from 290 nm to 3000 nm so yes, it does include light in the 440-490 nm range. As to intensity; there is no standard intensity developed by an LED and the intensity of sunlight varies with a thousand different variables. So, we need to know the intensity you are speaking of to be able to determine if the sun does in fact emit such wavelengths at a lesser intensity than your LED.

add to that that any wavelength of light can cause eye damage if great enough in intensity.
nap is offline   Reply With Quote
Old 08-22-2010, 01:37 PM   #9
Wire Chewer
 
Red Squirrel's Avatar
 
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,221
Rewards Points: 2,020
Default

White LED light harmful


Come to think of it, I don't think they have a true white led yet. It's basically a very white shade of blue, or maybe a mix of colors. I've noticed that led flashlights do look somewhat white, but there is still a very small blueish tint to it.
Red Squirrel is offline   Reply With Quote
Old 08-22-2010, 01:43 PM   #10
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

White LED light harmful


Quote:
Originally Posted by Red Squirrel View Post
Come to think of it, I don't think they have a true white led yet. It's basically a very white shade of blue, or maybe a mix of colors. I've noticed that led flashlights do look somewhat white, but there is still a very small blueish tint to it.
Red, blue and green sort of make "white". Adding a fourth color [maybe yellow?] gives you better fidelity but white light contains red, orange, yellow, green, blue and violet.
Does this sound like the color code for resistors?
Yoyizit is offline   Reply With Quote
Old 08-22-2010, 01:50 PM   #11
nap
You talking to me?
 
nap's Avatar
 
Join Date: Dec 2007
Location: sw mi
Posts: 5,407
Rewards Points: 2,000
Default

White LED light harmful


Quote:
Originally Posted by Red Squirrel View Post
Come to think of it, I don't think they have a true white led yet. It's basically a very white shade of blue, or maybe a mix of colors. I've noticed that led flashlights do look somewhat white, but there is still a very small blueish tint to it.
white light is produced by mixing actual colors of light. White itself is not a color but a combination of colors.

wikiquote:

Quote:
There are two primary ways of producing high intensity white-light using LEDs. One is to use individual LEDs that emit three primary colors[54]—red, green, and blue—and then mix all the colors to produce white light. The other is to use a phosphor material to convert monochromatic light from a blue or UV LED to broad-spectrum white light, much in the same way a fluorescent light bulb works.
nap is offline   Reply With Quote
Old 08-23-2010, 11:06 PM   #12
Member
 
Join Date: Dec 2008
Location: Dayton Ohio Area
Posts: 670
Rewards Points: 500
Default

White LED light harmful


A little off topic, but we recently deployed 8 of these for a facility.

They are WICKED bright, and the whitest light I've ever seen.

http://www.etcconnect.com/product.ov....aspx?ID=22003

__________________
-Andrew
DIY hobbiest
AndrewF is offline   Reply With Quote
Old 08-24-2010, 09:43 AM   #13
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

White LED light harmful


Quote:
Originally Posted by AndrewF View Post
A little off topic, but we recently deployed 8 of these for a facility.

They are WICKED bright, and the whitest light I've ever seen.

http://www.etcconnect.com/product.ov....aspx?ID=22003

Can you post identifying info for this assembly? I'd like to look up the specs. . .power draw, lumens, spectrum, etc.
There's supposed to be someplace maybe in Norway where they use similar lights to light up ski slopes for nighttime skiing.
Yoyizit is offline   Reply With Quote
Old 08-24-2010, 02:07 PM   #14
Member
 
Join Date: Dec 2008
Location: Dayton Ohio Area
Posts: 670
Rewards Points: 500
Default

White LED light harmful


Quote:
Originally Posted by Yoyizit View Post
Can you post identifying info for this assembly? I'd like to look up the specs. . .power draw, lumens, spectrum, etc.
There's supposed to be someplace maybe in Norway where they use similar lights to light up ski slopes for nighttime skiing.
I can, not sure what I can take a picture of that isnt included in the manufacture specs.

http://www.etcconnect.com/product.do....aspx?ID=22003

Advertisement

__________________
-Andrew
DIY hobbiest
AndrewF is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dark over light...Do I need tinted primer? melissaandkris Painting 17 09-09-2011 11:43 AM
new light and switch problem please help rebelbull Electrical 1 10-02-2009 07:39 AM
Help wiring ceiling light wylde8 Electrical 1 09-24-2009 07:29 AM
Motion Light tripping GFCI? Jonobp Electrical 5 09-07-2009 08:52 PM
Adding a light to an existing 3-way connection nthomp16 Electrical 2 07-21-2008 07:57 PM




Top of Page | View New Posts