I'm seeking an LED with no emission beyond (longer than) 480 nm. It's best if it was eye-safe so as little UV emission as possible is desired (> 400 nm ?). The few blue led's I've come across with peak or dominant wavelengths of 430 nm have very wide spectra extending beyond 480 nm.
Blue LED with no emission beyond 480 nm
Sep 12, 2008
3 Replies
Construct a cct that will turn the LED off when a freq > 480nm is reached ;)
;)
May be you could use ordinary glass as a filter: it partially blocks UVA (wavelength 400 and 300 nm) and totally blocks UVC and UVB (wavelengths shorter than 300 nm) due to the addition of compounds such as sodium carbonate (see wikipedia). Or other UV-filters that completely block UVA.
< May be you could use ordinary glass as a filter: it partially blocks < UVA (wavelength 400 and 300 nm) and totally blocks UVC and UVB < (wavelengths shorter than 300 nm) due to the addition of compounds < such as sodium carbonate (see wikipedia). Or other UV-filters that < completely block UVA.
This sounds like an excellent idea - what do you call it...? ``glass''. Where do you get glass from? It's illegal in my country to purchase/posses ``glass'' (melted silica ~= 3000^\\degree{} - (no not allowed to by phosphorous either)) unless you are not an individual and are trying to sell it with a business license.
I actually had some ``glass'', acetate paper, and a ``lens'' and a ``prism'' but they all turned into plastic somehow; right before my oven was stolen.
[ sorry just aggrevated at the moment - my pcb sucks because my printer fuses at too high a temperature so now I am using a borrowed laserjet 5 (works ok, but not my 4049) ]Join the Discussion
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