You guys just confirmed what I was thinking, I know .5A X 10V = 5 watts but the 1.6W rating was confusing me, thanks for the help. I know electronics, what I don't know about are LEDs and light specs. Is there a good tutorial on designing your own horticultural LED light? This 5W package puts out 1.6W of useable light energy, is this average for a 5W package?