Eye Hortilux® Double-Ended (DE) High Pressure Sodium grow lamps offer 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 1000 W and 2,100 µmol when operated at 1150 W. PPF µmol are measured between 400 and 700 nanometers.