Fact or Fiction - LEDs don’t produce heat

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On Mon, 09 May 2016 10:34:46 +0000

also leds can damage your eyes
make sure and check the data sheets
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So can the sun, yet I find it usefull.
http://machinedesign.com/blog/3-myths-surrounding-leds-0 http://eyebulletin.com/study-says-the-blue-light-does-not-damage-the-eyes/
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On Wed, 11 May 2016 18:03:57 +0000

lets get a group of physicists and engineers together and have them stare into some leds for a few hours just to prove to us how harmless they are
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On 5/11/2016 3:38 PM, Electric Comet wrote:

statement that LEDs can damage your eyes came from. What documented danger is there?
Bill
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wrote:

Let us see, an over current driven LED can pop and spread plastic shrapnel....
next
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On Thu, 12 May 2016 08:09:36 -0500

conduct your own get some leds and stare into them
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On 5/12/16 7:09 AM, Bill Gill wrote:

Not based on digging up any document, but high intensity LEDs produce light in the ultra violet (UV) portion of the spectrum (more efficient). The change to visible light occurs in the phosphors used to cover the LEDs. The primary difference between manufacturers devices lies in this proprietary mix which determines the color and CRI. The coating also needs to not degrade and withstand the intense heat. Cheap coatings can fail, exposing the intense UV light. Phillips makes some A19 style bulbs with this coating on the outer glass, away from the LED in the center. Some of the bulb 'tear downs' (where they examine the quality of the components remark on how nasty the exposed LED looks with this outer glass removed.
I doubt a fully exposed LED would cause immediate damage like with a laser, but it is similar to arc welding without proper eye protection.
-BR
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On 5/12/16 7:09 AM, Bill Gill wrote:

Just to be complete:
http://www.cree.com/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/XLamp%20Application%20Notes/XLamp_EyeSafety.pdf
Of course many of these warnings are CYA statements.
-BR
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Some LEDS have UV light. That can strain eyes. They mix colors in the unit to balance color.
Color is based on the physical thickness between layers in semi. Red was easy - large structure. Blue was tough. had to be small and special dopant. The blue might have some UV in it.
The tough ones - I have detected lasers used as LEDS. That is a problem. They put them in diffusion lenses but small beams are dangerous.
Martin
On 5/12/2016 8:09 AM, Bill Gill wrote:

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