Previously, metal halide and high pressure sodium lamps were used for the same. Though these grow lights provide an ideal light spectrum for the plant growth, they generate excess heat and consume large amounts of electricity and were very expensive to maintain. A more energy efficient alternative is the LED (light-emitting diode) grow light.
One of their major benefits is low maintenance cost. Their main aim is to emit only the color spectrum for the plant's photosynthesis. Hence, they consume less electricity in comparison to the traditional lighting system and other grow lights. On an average, they consume less than 5 watts of power for operation.
The wide-spectrum red light and narrow-spectrum blue light of specific wavelengths are configured in a particular manner. The red spectrum supplements natural sunrays, whereas the blue spectrum makes an ideal light for the plant's growth.
There are several models of LED lights, each suitable for various types of plants and their successive stages. For example, some are designed for vegetative growth, whereas some are specially configured to promote flowering and/or blooming.
Another advantage is less production of heat. With minimum heat production, water requirement also reduces due to less evaporation. The problem of high temperature root damage and plant dehydration is thus solved with their use, which further eliminates the need to install fans or cooling ducts.