638-nm LEDs (300 mol m-2s-1) in combination with HPS lighting (90 mol m -2s-1) and natural illumination 3 days before harvesting in greenhouse
638-nm LEDs (photoregulated flux) in combination with HPS lighting (90 mol m-2s-1) and natural illumination 3 days before harvesting in greenhouse, total PPFD maintained at 300 mol m-2s-1