Here is one honest answer. If you stuff a 400HPS into a small space you may have to much light/ heat and possibly not be able to get rid of it with ventilation unless you have a hurricane style fans. To much wind in your box means watering more often and can cause stress also. If you have 400CFL...you pull a bulb or two until you get the heat right. If your plants are heat stressed, you might as well be using a little less light, keep temps in check, and reduce the risk of hermi plants. Thus I now run 340 watts in my cab instead of 400 + and my plants are happy as hell. Heat stress hermied my last two grows and while I have killer weed.....I got tons of seed. This is surely more economical than building a new cab for most of us.
and he told you it was ok to have all those low grade lamps with low grade wires ( not industrial ) all attached like an octopus ???????
it is over - kill if that is 100 actual usage and not equivilant.im on my first grow and i wus jw if 6 100 watt 6500k cfls is enough for 2 plants??