Double Ended HPS Hortilux 1000W Grow Lamps are typically used by commercial growers with large spaces and high ceilings. DE HPS grow lights produce higher intensities of light due to the design, construction and internal pressures of the arc tube (light generating source). The physical design and shape of the DE grow bulb provides a consistent positioning of the light source allowing reflector manufacturers to optimize the focus and footprint of light over the plant canopy. 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 1950 mol of photosynthetic photon flux (PPF) when operated at 1000W and 2100 mol when operated at 1150W. PPF mol are measured between 400 and 700 nanometers. PLEASE READ DIRECTIONS BEFORE INSTALLING YOUR NEW EYE HORTILUX DE HPS.