Light Options For Tank Size?

Variant · Jun 13, 2020

I am getting a new tank that measures 39.4 x 22.44 x 19.7in. I already have a 8x24 ATI powermodule that measures 22.5 x 20.4in. Would this work? There would be a good chunky of space one both the left and right side of the tank (~8.5").

Or should I get a 4/6 bulb powermodule in the 36" length?

Ron Reefman · Jun 14, 2020

I think you will have some, probably not critical, but some light drop off at those 8" ends.

I'd try the one you have. If it's OK for you, great! If the light drop off is more than you are willing to tolerate (assuming there will some drop off) you can always get the bigger fixture.

jda · Jun 14, 2020

I would get the 36 as soon as you can. Until then, the 24 will work fine and just concentrate on keeping the high-light stuff near the center under the light.

If you only plan on keeping stuff in the middle, then don't worry about lighting the outside 8 inches.

Variant · Jun 14, 2020

jda said:
I would get the 36 as soon as you can. Until then, the 24 will work fine and just concentrate on keeping the high-light stuff near the center under the light.

If you only plan on keeping stuff in the middle, then don't worry about lighting the outside 8 inches.

If going for max coverage left to right with the 36" unit, the question then is 4 or 6 or 8 bulbs? If the light were ceneters, the 4 bulb unit would give me 5.25" front and back, while the 6 bulb unit leaves me a 2.5 inch gap front and back, and the 8 bulb gives me near total tank coverage with only 1" gap front and back.

Trying to be efficient to minimize light spill but also provide enough light coverage. It is not like I will literally have sps growing into the glass.

Thoughs on how many bulbs?