On Tue, 14 Mar 2017 12:24:26 +0000, Nightjar wrote:

Food quality UV traps use a sticky transparent film instead of a zapper.
The film is on a roll that advances every few hours and gets changed
about once a month. That avoids any falling fly parts, which could
contaminate food.

Makes sense, but falling is an understatement. A blue bottle zapped
by even the small domestic UV zappers explodes itself over quite a
distance...

--
Cheers
Dave.