The exclusive EYE HORTILUX® Super HPS spectrum provides 17 percent more overall spectral energy, and 25 percent more violet, blue and green spectrum than standard HPS lamps. This results in better overall plant growth and yield. Traditionally, high pressure sodium lamps have been used for flowering and fruit production. EYE HORTILUX HPS lamps were designed with enough violet, blue, and green spectrum to be used as a standalone light source throughout all phases of plant production. Manufactured in the USA; one-year warranty.