"legg" wrote in message
...
On Wed, 16 Jul 2008 17:56:02 +0100, "ian field"
wrote:

Anyone know why some IRLEDs have a blue tinted encapsulation instead of
water clear?


1) It's benign?

2) It's cheaper?

3) For ident/differentiation?

4) Mechanical filtering?

I've seen infra-red leds with almost-black encapsulation.

RL

The almost black types are ubiquitous in consumer electronics as the
integrated IR receiver modules, I was wondering why sometimes blue when blue
is at the other end of the spectrum from IR?