The 1,000-watt EYE HORTILUX® Double Ended (DE) High Pressure Sodium grow lamp offers a reliable light source capable of producing consistent high yields through many growth cycles. The exclusive EYE HORTILUX DE spectrum provides 1,950 μmol of photosynthetic photon flux (PPF) when operated at 1,000 watts and 2,100 μmol when operated at 1,150 watts. (PPF μmol are measured between 400 and 700 nanometers.) This spectral balance increases plant response and accelerates growth. Manufactured in the USA; one-year warranty.