Thats irrelevant because the hps cant be put close...
it's completely relevant, the lumens decrease dramatically when the cfls are further away from the plant as opposed to the HID, if you ever get a light/lumen indicator you'll see what i mean.
An air cooled reflector is designed specifically for HIDs to be placed closer to the plant so the heat that the bulb produces is ventilated out, it's not the light intensity that burns the plant it's the heat.
And i grow my plants as close as i can get without burning, which is about 8-10 inches.
And besides he said he wanted a 250W hps which in my opinion is INFERIOR to the CFLs with the comparable wattage. The 250w HPS does not convert electricity to lumens as efficiently as the 400 or 600w hps.