I installed in the air collector at the outlet of the air conditioning coils. Was the best place for me. Reduced mold formation in the condensate drain. I don't do microbiological testing but is easy to install (2 screw holes and 1 larger center lamp hole that I cut out). There is a special area on the holder that indicates whether the bulb is on (a glass "dot" with UV protection that shines through the light). It was on when I checked. I bought this brand (Honeywell) because I trust them and not cheap imitations, and I bought the 36 watt because I like the "killing power" of a dual bulb versus a single bulb (the bulb is 2x bigger, not two) .
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