Why do I need a PAR-Quantum Meter?

Dr. Bruce Bugbee, of Apogee Instruments, gives a quick overview on why PAR (quantum) meters are needed to measure photosynthetically active radiation; opposed to a lux, lumen, or footcandle meter. Since lux, lumen, and footcandle meters are less expensive, it is tempting to use them instead of quantum meters, however, they are highly inaccurate for plant research applications.

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