Reginald Neale wrote:
>
> ...
> My understanding is that the principle of operation is IR LED illuminating
> a tiny internal phosphor screen. I bought four of them and they varied in
> brightness. The brightest one was blinding at 10 mA.
>
> Reg

  Does anyone know how fast that phosphor is?

  If it's a really slow phosphor, you're going to have bad problems
using one of these as a strobe, obviously!

  Thought I'd ask. (Also I second the use of the Radio Shack LED's -
they have Red 5000mcd IIRC, Yellow 8000 mcd units also, though it IS
Radio Shack, and you can't always guarantee they'll have 'em in stock.
I have a local store where I know the purchasing agent, she stocks
anything I need, I just have to give her a call in advance & Jody calls
me when it's in...)  Think a LED flashlight on these things - I'm
considering an array of 15 for a wheelchair headlight with ultra long
life & no chance of vibration breaking the filamnts.  You DO need to
keep the lens clean or you'll reduce light output by up to 50%...

  Mark, mwillis@nwlink.com