Plant Science & Biology

YPF Calculator

Yield Photon Flux — weights PPFD by McCree-style relative quantum yield for blue (~0.75), green (~0.85) and red (~1.0) wavebands to estimate photosynthetically effective flux and spectral efficiency.

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How it calculates

Waveband quantum-yield weights are approximate McCree-curve averages; a full YPF integral requires the fixture’s measured spectral power distribution.

What you enter

Total PPFD (µmol/m²/s)
Blue (400-500nm) %
Green (500-600nm) %
Red (600-700nm) %

What you get

YPF (µmol/m²/s)
Spectral Efficiency (%)

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