Which Light is better

[fencer]

You have 2 4ft fixtures

1. has 4x 24w T5 ...so they would be 2 per row

2. has 2 x 54w T5

so which is the better setup?

[lastlight]

39w is 3 foot bulbs I think...

[kien]

I agree with Brett, plus I'm pretty sure the Lastlight is the best of them all.

[hillegom]

lol

[lastlight]

Har har!

[fencer]

Yes you are right. they are 3ft...okay I corrected my mistake

[lastlight]

If all things other than the bulbs are equal (reflectors, ballasts) then I'm sure more wattage will mean more output (option 2)

[Zoaelite]

Plus it will be cheaper to swap out 2 54W bulbs over 4 24W bulbs.

[fencer]

I would have thought the 4 bulb setup to be better because you have 48 w centered on two places rather than 110 averaged over the entire tank

[shrimpchips]

54" bulbs have better penetration and are stronger.