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A new study shows that LEDs can give greenhouse growers other lighting options that produce favorable results.

Previously, the only way for producers to substantially increase ambient greenhouse was to provide supplemental lighting from high-intensity discharge lights–most commonly high-pressure sodium (HPS) lamps. HPS lamps have drawbacks, however; they are only about 25% to 30% efficient, and have limited lifespans.

Another disadvantage is the high levels of radiant heat energy produced by HPS lamps; up to 75% of the energy from HPS lamps that is not converted to light is emitted as radiant heat energy, causing the surface of the lamps to reach temperatures as high as 450°C. To prevent leaves from scorching from exposure to the high heat, plants must be separated from the HPS lamps.

LEDs can offer growers benefits such as higher energy efficiencies and a longer operating life. To determine whether the use of narrow-spectra high-intensity LEDs is can be a practicable supplemental lighting source for greenhouse grown annual bedding plant seedlings.