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Discussion Starter · #1 · (Edited)
I know this has been discussed.... but haven't seen anything discussing whether there was a benefit to yellow over clear....

Anyone know???

Yellow:
Yellow T12 Fluorescent Tube Guard 4 ft Plastic Cover / End Caps - Light Bulb Surplus

Clear:
77305 LE40T12 W/CAPS UV FILTER Fluorescent Tube Guards at eLightBulbs.com

I have 30" bulbs for safe light, but need to swap, since they are currently fit with UFBL's....

I can't find a 30" Yellow Safelight bulb in a T12
*adding - but I can find regular cool white ones, so maybe just run those with the filters?
 

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There's no cutoff listed on the yellow tubes, but the clear ones will not help if you want 'safe lights' and are trying not to expose stencils--370 nM to 420 nM or so is where diazo sensitized emulsion is most sensitive, so cutting off what's under 370 isn't going to to be too much help. I'd also mention that at that price, you can get them from a screen supplier--really nice ones will be around twenty a pop.

It looks like the yellow ones are just colored, not actually 'filters' per se, although they might work well. Might be rough gambling just under a hundred bucks to find out though.

I'd also add that if you're looking for inspection lights to be used for a minute or two on a screen, I wouldn't worry about using warm white tubes--if you've ever exposed a screen with cool whites, which have more UV than warm, you know that with the bulb three inches away from the screen, it still takes a very long time to poorly expose a screen.
 
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