HORTILUX Double Ended (DE) High Pressure Sodium (HPS) grow lamps offer a reliable light source capable of producing consistently 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.