I have a Cade 600 2ft cube with one XR15 light, and I'm currently looking to swap it out for a 21" blade grow light. My tank is LPS and softie dominant and I'm wondering if I'd need to get one or two blades? From the reviews I've seen online they seem to be an impressive slim line light with a lot of punch, and the look of them when setup is what I'm wanting to go for.





