I just posted in the intro that I am very soon buying my first, possibly two as my other half really wants it to be two, bearded. I was rummaging through my attic looking for my old heat lamp fixture (which sadly i couldnt find) and came across and old blacklight tube fixture and wondered if this could be used to hold the uvb tube. the blacklight tube coming out of it is 18 inches from prong tip to prong tip, so i think (ok hope )that the 18in tube for UVB will fit. My question is that this light is not completely enclosed, see attached photos for details. Can I still use it?