Grow Lights: What is Yield Photon Curve?

February 2, 2019

The difference in the efficacy of the varied color spectrums of light on actual photosynthesis is called the quantum efficiency curve, or yield photon flux (YPF) curve.

A full-spectrum sensor measuring PAR from blue and red LED lamps.
PC: Elisa Wilde

If you take measurements using a standard quantum flux meter under a lamp that generates only blue light, you are going to get good PPF and PPFD values, even though blue light is less efficient at stimulating photosynthesis than red light.

Gardening Under Lights Book

Back to top

Tips in your inbox


Sign up for the E-Newsletter for my latest green industry news updates for pros + plant and gardening hobbyists.