Originally Posted by mr_X
T12s are more powerful than T5s, but if you individually reflect the T5, it's at least as potent as a T12, but with half the wattage. this is why they are the popular choice.
Well, mr_X here i have to talk, this is my master lol...
Doesn't matter about the watts of a lampsthe t5 are the new options but before was t8 and now the is coldcathote.
Watts mean power and in this case consuption.
Incandecent of a 60w and a florecent of a 20w and now a coldcathote of 15 you can see the have the same footcandles all but different wattage.