Not trying to hijack but......

I was in Menards the other day and was wandering around the lighting section. I came upon some HPS bulbs and was looking around. I found some bulbs where the wattage went from 35w up to 250w I believe.

Here is my question....say I have a friend who used 6 - 4ft. flouros for their last grow. Well, I was thinking he could buy 4 - 100w HPS bulbs to use instead. I asked the lady working and she said the bulbs can be used in a regular light socket. Being how they are only 100w I didn't see why not.

Cause obviously 4 - 100w HPS would put out more lumen's than the flouros, correct? His basement stays cool and ventilation is good. The area is 5ft x 2 1/2 ft and about 3 ft. tall.

What you guys think since we are on the topic?