Have a marine lighting question

[Kanta]

I currently have a 48" Aqua-GLO lighting system and the bulbs need replaced pretty bad. I got the light used and the bulbs are older than 9 months. But my problem is that GLO only offers 3 different types of bulbs. I was thinking to get a power glo and a marine glo bulb for my 55g fowl, which I might add a couple frags later on if I get comefortable enough. Are these decent bulbs to get and will they sustain life? Thanks ahead of time.

Marine GLO
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3733+13821+19761&pcatid=19761

Power GLO
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3733+13821+19760&pcatid=19760

 

[Kanta]

Bump

 

[fishy12]

This website should help you out in clarifying how much lighting you need.
http://www.americanaquariumproducts.com/Aquarium_Lighting.html

 

[Kanta]

I checked it over, It said that I should get 2 30w glo t8s which is fine. That is the fixture I have. But my fixture is a 48" light and the only bulbs that long for sale are 54w. Will this make that big of a difference?