Hydroponics is a method of growing plants using mineral nutrient solutions, in water, without soil. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite, gravel, mineral wool, or coconut husk
The Lumatek E-ballast is a performance leader. This 240v, 1000w unit powers both metal halide and high-pressure sodium lamps.