Best/brightest bulb for my tank?

[abelman]

I would appreciate some guidance as to what type of flourescent bulb I should purchase to replace the original 40w 48" T12 (GE) bulb that came with my 72 gallon bow front tank (with a one bulb hood). I asked at my LFS for a comparably bright bulb, that would best enhance the appearance of my freshwater fish (red parrots, spotted puffers, clown loaches, etc.), and they suggested I get a "Reef Sun 50/50" bulb, since it would be the brightest for my tank. (My tank does not have live plants.) When I tried that bulb, it clearly did not light up my tank as well as my original bulb - the tank appeared much dimmer and the colors of my fish were less enhanced. Hence, I would appreciate your advice as to what type (and brand) of bulb would be best suited for my needs (freshwater/no plants) and interests (brightest/color enhancing).
Also, can you tell me if it should make a difference if I would replace a T12 bulb with a T8 bulb?

thanks for your help.

 

[grimlock3000]

Check out Home Depot for a 48 in Phillips Daylight Deluxe bulb. They are 6700K temp range and very cheap.

T8s typically output a bit more light than a T12 to my knowledge.

 

[hashbaz]

T8/T12 refers to the diameter of the bulb. T8 is 8 - 8ths in (1 in). T12 is 12 - 8ths in (1.5 in). My understanding is that the smaller bulbs will somehow have more of their light reflected to the water - but give off the same amount of light.

 

[abelman]

Thanks for your suggestions, the verdict is in ...

I tried out every 48" T12 at Home Depot, as well as some higher priced ones recommended at my LFS, and I found the Philips Daylight Deluxe to be the brightest and most color-enhancing for my fish. (I do not have any live plants.) The bulb is a 40w, 2325 lumens, 6500k and costs $5.49 at HD.

Thanks for the tip, Grimlock.