So obviously you don't own a light meter, but I do. So I decided to do a couple quick measurements. Guess what? At 2 inches a 23 watt CFL only measures just under 10,000 lux . Under a 200 watt metal halide lamp it measures just under 20,000 Lux at canopy level. The only way I could get a CFL to even come close to matching that is to have it almost directly touching the light meter sensor. By the way a 600 watt HPS lamp will produce 95,000 lumens so even if your measurements above are correct HPS will still beat you.