What length AI Blades with Kessils?

[typical2]

I currently have 2 Kessil A360xs on a 4' 120 gallon. I'm looking at adding 1 Glow and 1 Grow. Kessils are mounted 6.5" off the water. I want to mount the Blades at that height. There is no hood on tank.

Should I go with 39" or 48"?
Would 48" mounted 6.5" above tank have too much light spilling over.

I'm currently thinking the 39" would be best in this case.

Thoughts?

 

[Gumbies R Us]

Bump for clarity!!!

 

[typical2]

Might be a question for down the road when more people have them set up...

 

[Court_Appointed_Hypeman]

I want to know too

I was thinking the 20ish inch ones for my 4ft tank to have on both side of center brace.

Still not sure.

 

[bnord]

I have a 12" on backorder to try out on a 13.3 g - looking forward to learning more

 

[typical2]

Yep, thought about the 21" model. 2 on each kessil. Price would be between that of 2 39"ers and the 48"ers. I'm in no hurry. I'll see what others do and like. Also not sure how well the hybrid mount will do on kessils

 

[Court_Appointed_Hypeman]

Yep, thought about the 21" model. 2 on each kessil. Price would be between that of 2 39"ers and the 48"ers. I'm in no hurry. I'll see what others do and like. Also not sure how well the hybrid mount will do on kessils

I think this is what I will do. . However, I am running just 4 T5 bulbs on my 75G at the moment, and the fixture is like 10 years old.

So I was thinking of trying 2 grows 2 glows of the 21 inch units on both sides of the brace instead of the T5. I do not know if 4 of these will work without supplemental lighting. And I have no idea if it is a good replacement for T5s alone.