The light in your link puts out 8000 lumens, is that per bulb? I doubt it. 8 - 42W CFL's put out 66.667 lumens per watt. x 8 bulbs = 22,176 lumens. So you're getting more with the CFL's But if the hydrofarm light puts out 8000 per bulb then you would have 32,000 lumens.. Not sure if this helps...