Behold "The HammerHead" Air Cooled Cob

I was messing with my equipment this weekend trying to find a way to keep my COBS cooler so I can run at 100w (Vero 29). I almost retrofitted an old air cooled hood, but this has worked out great. I've knocked my temps down by about 4 degrees F and can run at full power now.

All I did was cut a hole in a piece of 4" and attach it to the exhaust.. The air flows from the bottom of the tent, past the lights and right into the hose. The heatsinks no longer get hot.

I am a noob so please excuse my ignorance but why would you want to run at 100watts would it not be more efficient to run your cobs at a lower wattage? What are the pros of running your cobs at a higher wattage. Again I am newbie so excuse my questions if they are obvious... cheers