Quoted from the good olde OG growfaq:

"While the lumens measurement is based on the sensitivity of the human eye to light, PAR Watts objectively measure the total watts of Photosynthetically Active Radiation (PAR) emitted by the lamp. It accounts for the nutritional value and is a direct measure of light energy available for all-important plant photosynthesis."

This FAQ put it into alot of our heads that we need to keep a proper measure on PAR rather than lumens.
My question is, has anybody found any useful information on PAR? I've been looking but have turned up nothing useful. Mainly what I want to know is the potential PAR from artificial lighting. But if anyone has any info on PAR that they would like to share/discuss I would be happy to hear it.
peace
davejohnwright Reviewed by davejohnwright on . PAR for plants, lumens for people (Familiar to many of us) Quoted from the good olde OG growfaq: "While the lumens measurement is based on the sensitivity of the human eye to light, PAR Watts objectively measure the total watts of Photosynthetically Active Radiation (PAR) emitted by the lamp. It accounts for the nutritional value and is a direct measure of light energy available for all-important plant photosynthesis." This FAQ put it into alot of our heads that we need to keep a proper measure on PAR rather than lumens. My question is, has Rating: 5