I have struggled a bit with understanding lighting. I found this clip recently that I thought was excellent from the University of Utah.
Explains PAR, PPFD, Daily Light Integral DLI. Also how to measure the efficiency of a light. Goes through Light spectrum, red far red, UV etc.
https://www.youtube.com/watch?v=ID9rE5JewVg
Explains PAR, PPFD, Daily Light Integral DLI. Also how to measure the efficiency of a light. Goes through Light spectrum, red far red, UV etc.
https://www.youtube.com/watch?v=ID9rE5JewVg