The Philips Master GreenPower Plus EL lamp is a professional European made 400 V high frequency horticultural 1000 watt HPS lamp. It is nitrogen filled with a quartz glass outer jacket for perfect optical quality. Double ended lamp base for accurate lamp positioning. This lamp is extremely high photosynthetic photon flux (ppf) at 2,100 μmol. There is no wire frame. Only suitable for high frequency, high voltage electronic ballasts. Oil from your hands can damage the lamp.