junkboxer, is that a 400 you are using. It's good to keep the light close to prevent stretching and what not but those plants are still very small. Have you tried raising it to 16 inches or so and see if the plants react well to that. If not move it up a little more. I'm guessing even though air cooled the glass still gets hot, maybe to hot. What are your temps at plant tops w light on?