In my experience the LED panels are junk and despite the favorable wavelengths. I bought 3 of these (one red and blue), (one red, blue, and orange) and (red blue and white). The lights are not very powerful obviously and they don't promote good top growth. They are slightly less effective than a good T5 fluorescent bulb. The "affected" area is also reduced by these LED panels. Unless they are a few inches from the plants, they won't do much. At least the fluorescent long lights have a bigger surface area they can cover. Metal Halide or HPS bulbs are much better, but are much more expensive, burn out quickly, and drain electricity. I guess I am glad we have the sun.