Table 2 Peak wavelength (λpeak), efficiency (W plant available per W of electricity) and photon conversion efficiency of electricity to quanta (COEff, 400–700 nm) of five different commercially available LEDs

From: Estimating the quantum requirements for plant growth and related electricity demand for LED lighting systems

Visible color λpeak Efficiency COEff
nm W W−1 µmol J−1
Hyper red 660 0.46 2.55
Blue 470 0.57 2.18
Deep blue 451 0.50 1.89
True green 521 0.18 0.78
Cool white 445/555 0.28 1.35
Hyper red:blue (5:1) 470/660 0.48 2.47
HPS (SON-T, 400 W) n.a. 0.29 1.53
  1. LEDs at typical test conditions (forward current: 350 mA, temperature: 25 °C), a combination of deep red and deep blue and a High Pressure Sodium lamp (SON-T, 400 W)