Best way to mount 3 XR15s

[Giek]

I recently got 3 XR15s blue for my 3'x 18"x18" tank. Mainly acroporas.

Power output and intensity will be set with a par meter.
I'm not sure whether to mount all of them the "normal" way, with the led puck left to right, or if it is best front to back to have better coverage.
Or else, I'm thinking of mounting the 2 at the sides front to back, and the central one left to right (being the middle the portion with the most overlap from the different fixtures).

Anyway, I'm planning to add soon additional light for better coverage, in the form of bluw led strips and a whitish T5 bulb per side of the 3 fixtures.

How should I mount them? Every suggestion is well welcomed!

 

[bubbgee]

Front to back for better coverage but that won't matter when you add the T5s (I did this as well).
XR15s coverage is only 12x12in (according to BRS). You might need another one with 3 ft of length.

 

[aus1230]

Front to back for better coverage but that won't matter when you add the T5s (I did this as well).
XR15s coverage is only 12x12in (according to BRS). You might need another one with 3 ft of length.

you think for a 36in length tank you need 3 XR 15s?

 

[bubbgee]

you think for a 36in length tank you need 3 XR 15s?

For SPS dominated or Mixed, four. For LPS and softies, 3 is fine.

 

[aus1230]

For SPS dominated or Mixed, four. For LPS and softies, 3 is fine.

Dang I guess I better start saving some more lol!!

 

[aus1230]

For SPS dominated or Mixed, four. For LPS and softies, 3 is fine.

do you feel it's better just to do two XR 30s then if you plan to upgrade to a bigger tank later down the road?

 

[bubbgee]

do you feel it's better just to do two XR 30s then if you plan to upgrade to a bigger tank later down the road?

I have 2 XR30 blues already and adding one more. I did the research and concluded I was better off with XR30s than XR15s.