well, some bulbs have higher efficiencies measured in Lumens/watt. And it's a lot harder to build a box with 100 2 watt bulbs rather than one 200 Watt bulbs.

You should consider the cost of buying all the extra fixtures too. I think having medium sized bulbs say 85Watt would be the best as you can spread them out so all plants get good light, not just the ones under the bulb (if you had one big one)
harris7 Reviewed by harris7 on . Amount of CFL vs Higher Wattage. Is it worth it to drop the extra money on the big CFLS (105-125 watt 30-50$ a light) Or use multiple low wattage? What do you guys with experience think, because I'm considering using all CFLs to save money but still would like to attempt a sea of green grow in a 4X4 organic soil bed (for 16 clone SOG). Rating: 5