This Galaticlit Super HPS DE 1000W Bulb provides 35% more available energy than the standard high pressure sodium lamp. Deliver an optimized spectrum and high-level pf photosynthetic active radiation to promote healthy plant growth. Specifically designed for high frequency electronic ballasts. The absence of frame wire eliminates an shadows in the beam. The jacket is made from quartz glass. For horizonal burning only. One Year Warranty. Compatible with both magnetic and electronic ballasts.