I keep hearing about people talking about CRI, lumens, and PAR. In LEDs for growing why does CRI matter if the LED is trying to match chlorophyll? Lumens are part of the visual spectrum so why does it matter at all if the PAR is 500 at 4'x4' and 48" throw. Why would you need more lumens or higher CRI if the PAR absorption and chlorophyll are the maximum amount the plant can possibly take in? Seems like lots of work to get a straight answer.