Those cheap par meters dont tell u anything with leds. They are wrong. You would need a highly expensive one calibrated to work with leds. U need to watch ur corals and see how they react. Think of it this way. Leds without optics is like being outside in the sun getting a tan. Optics are like a magnifying glass the tighter they are the more concentrated the light is to the corals even tho a par meter may say otherwise. I run my leds at a low par reading because any higher and corals bleach and fade. If i had wider optics i would get highr par even though it wouldnt increase growth or color. Hope i explained this well