What linear fixtures have users had good luck with? I'm currently shopping for a smaller fixture, which I will replace as the cage grows. For each smaller fixture I find, the reviews are terrible. I do understand that I need to change the bulb every six months, as all uvb bulbs lose efficacy over time. A two foot long or larger fixture just seems like overkill for now.
Would it be ok to mount a longer fixture on the side of the cage, or does it need to be overhead?