violet 380â??450 nm
blue 450â??495 nm
green 495â??570 nm
yellow 570â??590 nm
orange 590â??620 nm
red 620â??750 nm

obviously, if PAR is between 400-700, lumens wouls not be an exact representation of the plant useable radiation a plant can use. and PAR is exppressed in a value, its actually PAR lumens...
Hagbard Celiene Reviewed by Hagbard Celiene on . HID vs CFL in a small one plant situation, given light spectrums being ballanced between each situation and all other factors the same, would you see a difference between ~300 watts of CFL, and ~150 watts of CFL supplimented by say a small 50 or 75 watt HID? my main areas of concern are with potency, density, and mass, as well as time till maturation. Rating: 5