As far as high humidity and lighting goes, you shouldn't run into a problem if you use fixtures designed for use outdoors. These fixtures are made in a way to put up with water, high humidity and moisture. As far as the screening around the light fixtures, may I recommend something to you... I used to use the screening around the basking bulbs, but have since removed the screening, as the screening itself offers a greater risk of nasty thermal burns..
But as far as humidity goes, I suppose you can put acrylic over the flourscent fixture, as acrylic allows UV penetration, whereas glass blocks the majority of UV radiation from passing through. But if you have outdoor fixtures, I don't think you'll have such a problem.. I have had indoor fluorescent fixtures ruined after using them in one of my tree monitor enclousures, due to the high humidity and moisture.. Once I switched over to outdoor fixtures, I never encountered such a problem..
Cheers, I hope this helps a bit, take care, have a wonderful day.
Bob
treemonitors.com
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TheOdatriad

