I just took the 4 smaller plants off a stand because they where getting fried from the lamp. The closet has 1 two fan system moving air around. But since the warm weather has arrived in California, I needed to move the four plants to the floor. The taller plant does not seem to be bothered by the light radiation/heat (don't ask me why). As far as height of the plants, I have plenty of space to handle a 6 foot plant if need be.

BHG