These LED lights really are amazing and have come such a long way in a very short period of time. The 2014 Nobel Prize for physics went to the inventors of the blue LED. The blue LED is needed in the production of other colors like white and is the reason LED grow lights are even possible today.
LEDs provide us with with much more light while using the same amount of electricity when compared to older High Intensity Discharge technologies. They are much more efficient because they turn less energy into heat which allows growers better control.
Most LED grow lights will still need fans to help cool them down but can get away with fans that very closely resemble computer fans.