Solid-State Lamp for the Improvement of Nutritional Quality of Leafy Vegetables
A solid–state lamp for the reduction of nitrate concentration by shotr–term pre–harvest treatment of leafy vegetables is described. The lamp contains 36 3–W light–emitting diodes (LEDs) operating at a wavelength of 640 nm that generate a photosynthetic photon flux density of up to 300 mol m2 s1. The lamp is driven by a switch–mode power supply with a dual feedback, which allows for dimming in the presence of sunlight, compensating the output drifts, and protecting the LEDs from excess current. The luminaire of the lamp was designed to withstand humid environment and to avoid exposing the plants to thermal radiation. A greenhouse lighting facility containing 10 lamps with a common photoregulator was demonstrated. Ill. 6, bibl. 7 (in English; abstracts in English, Russian and Lithuanian).
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