In my opinion, i think you would be better off with the fluoros..Because of the small space the plant would be able to utilize the light much better. But also because of the space you will only be able to grow one or two plants. Try to stay away from tube fluoros. Go for Compact Fluoros. They put out much more lumens.

The MH light will get pretty hot, the fluoros wont. But in order to fully utilize the CF light, you should paint the inside of the grow box flat white, if its not already.

There is a good growing method to keep the plants small yet yield quite high, if you would like to know email me: [email protected]