The biggest problem you will have with too much light is wasted electricity. Are your lights too close to your plants and having too much heat now. The HPS will produce a lot more heat than the flourescents so that could be a problem.
rnf232s Reviewed by rnf232s on . Too Much Light? I'm growing 2 plants. Under fluoresecents they do fine, but when I put them under an HPS (high pressure sodium) light they seem to wilt and not grow well. The light is 2 feet above the plants. What is the problem? Rating: 5