In all i´ve read i must say that fluoros are a real good deal, not because they are more effective cause they are not (even if they do stay closer to the plants, wich is related to light dispersity) but for the simple fact that they are cheapper to buy, produce less heat (another reason why u can hang them so close to ur plants) and they pull a fair less amount of juice out of the power line...

In other words i use Fluoro tubes for seedlings and veg only, after that i put them under the 400w HPS...but i can tell u for sure that my next grow will have both of them in the room...and after this next grow i will try one of those MH conversion bulbs just to compare results...u should try that urself if u can...if u can´t, well stick to the fluoros they sure can deliver....happy growing m8.