PAR

From The Aquarium Wiki
Jump to: navigation, search

Photosynthetically Active Radiation. In the aquarium hobby this is the closest measure of useable light.

What is PAR?[edit | edit source]

PAR is a measure of light from the 400 to 700 nanometer ranges. With emphasis on the colors of the specturm that matter most to photosynthetic creatures. PAR can be measured by a PAR meter or a Quantum meter.