well 25,000 lumen of anything is going to penetrate just fine. hell a 250w hps spits out about 30 ish lumen. but you have to deal with the heat! main reason why CFL's are good. and if you know what your doing you definitely can get killer results.

my photo's speak for them self. cfl's 100% veg to flower

I wouldn't put an HPS in anything smaller than 9 sq ft which is a 3x3. a 400w hps is typically designed to run in a 4x4.

FYI, if you setup your cfl's properly, why would you need to adjust them all the time, I don't.

also power draw. If I was running HPS,.. I would use 220v. which is actually interesting. how many growers are using 220v

CFL//
1. simple
2. less heat
3. bulbs are way cheaper
4. you can customize your light setup
5. no need for tons of cool tubes, ducting and inline fans that keep you awake at night, (more clutter)