How green is white light? A comparison of basil growth under green or white enriched LED light regimes
2015
A growing number of evidence shows that plants benefit from a presence of green light in a spectrum of a light source. Green light is transmitted through plants' organs and is efficiently utilized in deeper layers of cells and in intracanopy leaves. Green diodes are sometimes used in LED luminaries. Optionally green light can be provided as a part of a spectrum of more efficient white LEDs. Yet the effect of broad-spectrum LED light on plant growth is not fully understood. We compared the growth of green and red cultivars of basil, Ocimum basilicum under blue-red-green (BRG), blue-red-white (BRW) and red-white LED light regimes of the same photon flux density and the same blue:red ratios. No significant difference was observed in biomass accumulation, leaf production and branching under green or white enriched spectra. Only red cultivar showed reduced growth under decreased blue:green ratio. Depending on the method used for the estimation, BRW regime consumed 10 to 20% less energy than the BRG regime.
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