I've had these strips on my four 10 gallon tanks since I began planting my tanks over a year ago. I use two per tank, and I've had nothing but happy growing plants. Since the light only reaches down about 9 inches, these lights are quite sufficient for a planted tank. I have lilies, crypts, etc., and all are happy. I have to trim the growth monthly and keep a grow out tank outside. I use leaf zone weekly, no co2, hobs w/bio balls, and big bubbles without the stone to really churn the water without the current a powerhead causes. Check out my photo album/gallery and see for yourself. People shouldn't pass these lights over for planted tanks. As long as it is not a deep tank, these are fine. And if it is a deep tank, just place them under water closer to your plants! Love these lights!