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New to seed starting, my mesculin mix germinated fine and I put it under a 13W fluorescent light and it seemed to be doing ok. I got a new T5 6 bulb light and put my lettuce bout 3" under the bulbs and now all my seedlings fell over from the heat. I have read numerous places that the lights need to be no more than 4" above the seedlings but how do I dissipate all the heat so it don't kill them?