well i have this large exoterra terrarium that i used to use but now its just sitting there. i want to make it into a vivarium type of structure. the dimensions i think are 18 x 18 x 24. so its large. what i want to make it like a planted highland terrarium but with the plants in pots and the pots in the substrate. thats not the problem though. the problem is my lighting. what kind of lighting am i going to need for the neps (which would be about 17in from the top) to grow well and attain good color, while still being cool enough to grow the plants? how would i situate them?