Switching from MH to T5?

[i have crabs]

i switched from 2x 150w mh to a 8 bulb t5 tek light on my coral tank wich is 28" deep i noticed a huge difference in brightness but im not shure if the jump in par was quite as dramatic since i havnt noticed and difference in my corals really,im thinking of eventually switching to 3x250w with some t5 aninics when i have the extra money since i miss the rippiling look already