Theyre ok but nothing compared to reefbrites. For a budget light, they suffice. Have a set on a cube tank for morning start up light and theyre dim compared to reefbrites on a different tank. Youre better off with them as moonlights
I would not use them as your only light source if your goal is to grow photosynthetic animals. Early LED's ended up performing poorly due to the lack of full spectrum - these are an older design, with just white and blue. I am not aware that they've been redesigned.