I'm also interested in how well they work for the plants. I don't think their output spectrum is very wide (similar to LED), so you may need to supplement them with a flourescent tube in the 6,000 to 10,000k range. I don't think the power will be a problem, since they are crazy bright.
EDIT: Your camera sees a lot deeper into the red (IR) & blue (UV) spectrums than your eyes can, so the camera can use more than the amount of perceived light you can see.