The U shaped bulb in my bug zapper is a blacklight bulb. I cant find replacement bulbs locally. To mail order one will cost me around $34. I'm not willing to pay that much, particularly since the zapper only seems to kill moths and night bugs which are not a real problem anyhow. I hung it to hopefully kill flies. I'm not saying it's worthless, but it's not worth $34 for a bulb which will probably only last a year.
However, I have not yet ripped the thing apart, but I'm assuming it's made with some sort of transformer to create the high voltage in the screening around the bulb. Then there's this florescent blacklight bulb with associated ballast.
If this is the case, why must the bulb be blacklight anyhow? Why cant I just wire a common lightbulb socket in the fixture and put a small CFL bulb inside the unit? After all, my white porch light brings in bugs like crazy. Why not use a plain CFL to attract the bugs?
And, if there is some important reason that it must be blacklight, Walmart sells a blacklight CFL bulb for $7 or $8. That much I'll pay.
My question is why they use blacklight bulbs when a plain white bulb draws bugs?