For heating, with the false bottom, i would plumbed in an aquarium heater. It does 2 things, heats the water, which heats the air, and it also creates humidity. For lighting, you really only have 2 options, t5ho or led. The t5's are out since there are no 18" fixtures available. You could use led conversion bulbs if you already have the fixtures. Ne herp has what would work. Led lights with incandescent bases. But they are not cheap, about $40/bulb. The height and depth are what are going to be the killers of the light.