Yes, lumens are the measure of light output. The new T5 lighting systems have been compared to that of MH
output with less heat and less power. I personally don't like the look of them I like the shimmer and intensity of the MH
. This all depends on what you are putting these lights on too. If you have a FW
tank or something that doesn't have high light demanding critters then the T8 or T12s should be ok.