MH Lighting question

[SaltyK]

I am starting my 215g tank project and was wondering about lighting. I have 2 250w se now i wanted to either add 2 400w or two more 250w. The tank dimensions are L72.5xW24.5xH29

 

[nanojg]

I would get 400's if you want to put high demanding animals on the bottom half of the tank, 29" is deep

 

[kfennell]

Ive read people say that you need 400w a number of times, but the LFS has a really nice 215 FULL of acro and its growing more then halfway down the tank for sure. There are even clams just a few in off the bottom. I am going with 4x 250w on my 225 as a result.

 

[SaltyK]

thanks for the info i figured 400w. But i have seen people with 2-3 250w as well so wanted some opinion on it.