I will soon be making the swap from 250w MH to the GHL Mitras 7206 fixtures. My tank is young and sps are frags, but I don't want to shock them. Since I don't have a par meter, or easy access to one, my plan is to check my lux readings at the surface with the MH and then try to match (probably undercut actually) those readings with the leds. Is this a solid plan, or should I be aiming for something different to minimize shock?