CA> TW>>> The other typpe uses small capsuled excitable phosphor
CA> TW>>> with a Tritium source, H3 included.that decays giving off
CA> TW>>> a particle that exciteds the phosphor causing it to glow.

CA> ->> Ah, I guess that's the stuff they use on the radioactive
CA> ->> "EXIT" signs I've seen in some places too... is it
CA> ->> encapsulated in small glass bubbles or something?

CA> TW> That appears to be what I am talking about. And somewhere
CA> TW> on it it should have a little radioactive sticker required
CA> TW> by Law.

CA> With recent developments in LCDs they have no need to use this
CA> at all. A lithium battery could power the EXIT sign in a
CA> power-outage and no need to play with this dangerous stuff
CA> anymore. (my two cents)

 You still have the power riquirements of
the back lighting.

 Some Exit signs have battery backup; but,
the "glowing ones" are considered to be
more reliable. Nothing to burn out nor
maintain.

 TTYL.

 Robert

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