LED lights for growing.

Here is an example of the new range of technologies that are available for agricultural lighting. These systems are tunable to a variety of spectrum profiles. Putting the power in the frequencies plants use to grow and fruit. These systems are only getting better, cheaper and use less power the old alternatives for plant lighting.

http://www.ledsmagazine.com/articles/2017/12/lumileds-sunplus-leds-prove-effective-in-horticultural-lighting-study-on-lettuce-by-lesa.html