I'm thinking of adding an Orphek IR4, considering they seem reasonably affordable - the Natura iCon is out of my price range for the foreseeable future. Given this claimed spectrum and PAR below on my current lights, any thoughts as to which model I should choose? I feel like I need more red/IR, but the "Red plus grow" seems rather overkill for anything other than a refugium?
My tank is 17 & 3/8" deep, for reference, though the sand bed will be 2" deep, so bottom will be approx 15". For reference, however, the light bars I have are 24" long, and the tank is 35".

My tank is 17 & 3/8" deep, for reference, though the sand bed will be 2" deep, so bottom will be approx 15". For reference, however, the light bars I have are 24" long, and the tank is 35".

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