I'm glad I didn't trash my old T8 fixtures after comparing with shoplight 4000K LEDs. LEDs have been great for greens without any input of natural light, but they are a problem for tomato seedlings. The narrowband spectrum of LED is harder for them to use, afaict, and the problem of tomato edema under LED's is well documented as I linked up in another recent thread. OTOH my repaired T8 fixtures with new 6500 K bulbs are definitely doing the job. I have tried 4000 and 5000K to compare but I always liked the 6500 K better, all my plants have responded better than other color temps.
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