HORTILUX Double Ended (DE) High Pressure Sodium grow lamps offer a reliable light source capable of producing consistently high yields through many growth cycles. The exclusive EYE HORTILUX DE spectrum provides 1950 μmol of photosynthetic photon flux (PPF) when operated at 1000w and 2100 μmol when operated at 1150w. PAR μmol are measured between 400 and 700 nanometers.