MH acutally uses less electrical power to generate the same amount of light, they have the highest efficiency of any light source except sodium lamps but they are useless for us.
how many watts total of T5 do you use, how many watts total MH would you use to get the same lighting, from what i have seen you need more T5 watts to equal the same lighting as a MH setup.
I build and design underwater lights at work and we use MH exclusivly as they generate way more light than the equivilant T5's we tried, T5 dont have enough raw power to light a large amount of water, they do seem to be bright but only from up close, The MH lights are visible for miles underwater, while the T5 were maybe 100ft untill they dissapeared, both were tested in the same conditions...
top it off that i love the MH shimmer effect and to me that is the trump card.
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