LED grow lights are lamps especially developed for cultivation of plants and made with light emitting diodes.
Because these diodes do not lose any energy producing heat, LED systems have higher energy efficiency than HID lamps, since there is no waste of energy by producing heat. Thus, these diodes are grouped together to increase the overall light output of the lighting system.
Another major advantage of LEDs is that we can find all the lighting spectrum. In the case of marijuana, we are interested in mainly blue for the growth phase and red for the flowering stage, although they often make combinations for the best light spectrum for each phase.
As stated above, LEDs almost do not emit heat, and the little heat produced is emitted upwards - light is being emitted downwards -, allowing us to work with marijuana plants really close to the light, although it is advisable to separate them between 10 and 15 cm to properly mix the different colors that make up the spectrum.
We can also highlight another great advantage of LEDs, which emit light continuously, unlike the hps or halide bulbs that emit intermittent light that, although imperceptible to the human eye, causes some stress to the plants.
Furthermore, LEDs do not reduce light output throughout their life.
Finally note also that by using LEDs the climate control management becomes an easier task because the absence of fluctuations in temperature and humidity, what makes us not forcing the system.