par meter

[jasin401]

what is a par meter?

[Ron Reefman]

The short answer is a light meter that reads PAR light.

"Plant chlorophyll absorbs light at wavelengths of 400 to 700 nm. This is termed Photosynthetically Active Radiation (PAR)" - Huebert.

Here is a link to a fuller understanding:
http://www.thekrib.com/Plants/Tech/intensorama.html