I have been trying to get a staight answer myself.
I have a 48" satillite for my 60g, and I want to get 2 - 30" satillites for a 90g long.
My Porc puffer seems a little sensitive (but he has been sick).
LFS saya it makes a difference how deep (or tall) your tank is.
I found good info at another site. Gina's Aquarium supply or something.
It says our lights are good for LR and some corals, but only in certain size tanks.
Good luck.