Watts is watts

>The question is, what is the effiency of MH vs FL, how much light out per
>watt in do you get?

My little lighting reference book says

Metal Halide -   50 to 60 lumens per watt  (for 175 to 250 W lamps)

Flourescent -     70 lumen per watt (32 W T8s)
                        33 to 52  lumens per watt (40 W T12s)

This seems to indicate that T8 flourescents are the way to go if efficiency 
is your criterion.

Bill Hamlin, P.Eng.
Power Resource Evaluation Engineer
Manitoba Hydro,  Winnipeg, Manitoba, Canada                     
Personal homepage:     http://www.mbnet.mb.ca/~hamlin/bill.html