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
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.
Just to be complete:
Of course many of these warnings are CYA statements.
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.
On 5/12/2016 8:09 AM, Bill Gill wrote:
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