The manufacturer may be able to supply you with the spectral analysis for a particular light source. For example flourescent bulbs use UV to cause phosphors to emit light and may absorb most or all the UV in the process.
How do you know if the ultra violet light is filtered from a light bulb?
If the bulb is made of glass then it probably is. Glass blocks most UV light. Blacklight bulbs are made from crystal instead of glass to allow the UV to pass through.
Reply:Typical tungsten light bulbs produce light much closer to the infra-red end of the spectrum than to the ultra-violet end.
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