Electricity savings in greenhouses with LED plant-light systems

Under controlled climate chamber conditions and in test growth houses, the project examined whether the LED light source ability to regulate the emission spectrum can optimise production of different potted plant types. Adjustable LED test lamps with special control electronics were developed to adjust blue-red LED light conditions, and the lamps were used in two test series on chrysanthemum plants to map the production effect from high-pressure sodium lamps, pure red LED light and LED with 38% blue light and 62% red light, respectively. The tests provided new knowledge that is now used in another Elforsk project. (340-040).