APOGEE LIGHT METERS:

The BEST ePAR / PPFD / PPF LIGHT METER - Quantum Flux Reader APOGEE is the best Company in the World - MADE IN THE USA

Perfect for measuring light distances of Cannabis plants and other plant as well. LED Grow Lights the MQ-610 ePAR 2021

version is the Best they have created to measure from UV to Far Red. Including measuring of purple type LED's.