UV bulbs

there are two types of UV tubes for bug zappers: Black light & Black Light-Blue glass
GEs website says the difference btwn BL and BLB is that BLB have dark glass which traps visible light producing the maximum amount of UV? this doesnt make much sense to me...having an opaque glass will just trap visible light not generate more UV, right? or not? thx
http://www.gelighting.com/na/home_lighting/ask_us/faq_ballasts.htm
Blacklight-blue bulbs are designed with a special deep-blue glass that filters out visible light, producing the maximum amount of ultraviolet light possible. If you're looking for a blacklight that produces the minimum amount of visible light for an especially sensitive area, blacklight-blue bulbs are an ideal choice
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beerismygas wrote:

Hi, That means amount of pure UV vs. UV plus visibile lights. Not more UV light.
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Tony Hwang wrote:

Which one do the bugs like better?
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I have experimented in this area about 30 years ago, and found insects to be more attracted to UV plus visible, especially blue, than to UV alone.
- Don Klipstein ( snipped-for-privacy@misty.com)
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