XR30 Pro vs XR15 output

[tankslave]

Just wondering how the XR15 maps out 825 PAR while the XR30 pro maps out 1125. The two pucks arn't that far apart?

Also, I've seen recommendations for three XR15s for a 4x2x2 tank, what about a 2x2x2 (60g) cube?

 

[Alex Y EcoTech]

tank,

The XR15w Pro is a very power light given its size. That said, for an aquarium your size (2x2x2) a single XR15w Pro would provide you with plenty of light to grow any type of coral.