PAR stands for ‘Photosynthetically Active Radiation’ and don’t worry it’s not the bad kind of radiation. PAR is measured in units of micromoles per sqm - per second (µmol/m2/s) known as Photosynthetic Photon Flux Density (PPFD).
PAR is without a doubt the most significant way to measure light in the spectral range of solar radiation from 400nm to 700nm. As humans we can only measure light intensity as we see it with either lumens or lux but of course plants are not humans but are photosynthetic organisms. We like to say 'Lumens are for Humans'.
Our Budmaster II range of led grow lights has more PAR output than any other LED or HID grow light at a useable range of 24 inches plus.
What do we mean by a useable range?
Well the closer you have any light to a plant then the more it will photosynthesize until the light gets too close and starts to damage the plants.
So for example a standard 600w HPS hanging guideline to avoid heat stress is 2ft above the plants canopy however hanging any led grow light this close to your plant will seriously cut down on the effective coverage so with LED to get the effective coverage you generally need to hang the light further away and be safe in the knowledge that the penetration and par is high enough. By having more effective coverage you cut down on the amount of lights and energy needed to grow your plants.