I would like to know what is the correct mounting height for a 24" 6% t5ho bulb. They say 12-18" but I know there are alot more variables. I have a 2x2x4' screen cage and plan to keep plants within 8-10" from the top. I like alot of plants. So with that kind of setup I'm guessing I don't want to set the light fixture on top of the cage, probably mount it 6-12" above the cage. Does this sound about right? If it makes a difference I will probably order the new dual t5 fuxture from lightyourreptiles to have the extra plant bulb in there aswell. Thanks, Stephen