I have a great deal of indoor lighting. You will not usually get too much lighting. The main things to watch for are leaf burning at the tops near the lights. If the leaves are being burnt (brown) or bleeched (white), then they have too much light. Do not confuse lighter green foilage that is new at a top as bleeched. A bleeched top will become white. Light green is normal on younger leaves.

The previous comment about heating is also apt. In the same spirit, you may need to water more often as heat increases.
omnibuddy Reviewed by omnibuddy on . IS THERE SUCH THING AS TO MUCH LIGHT? I was wondering if you can have to much light? I have 2 55w(250) plus 6 42w(150) CFLs for 2 plants, 1 55w and 3 42w per plant in a 3' wide x 20" deep space. would i get a better yield if i just had one plant under that many lights or would that be to much for just one? Rating: 5