Without starting another thread, its not all about lumens. I agree that the HPS will put out a lot more lumens, but the HPS is only 35% efficient.

It uses nearly 20% of the wattage to create heat.

Also i think 8700 lumens sounds a bit stingy for 250w of cfl

I have a 125 w envirolite CFL that puts out nearly 12,000 lumens and more importantly is 100% par.