Ushio's US5002272 Double Ended (DE) HiLUX Gro high pressure sodium (HPS) 1000-watt grow bulbs are designed to deliver 10 percent more light than an high-end HPS bulb. The Ushio DE 1000-watt HPS bulbs degrade slower than traditional single ended HPS bulbs. In fact, after 10,000 hours double ended lamps will still output approximately 90 percent of their original intensity. Double Ended HPS bulbs are more stable than traditional single ended HPS bulbs, and this allows them to have a 10 percent increase in light intensity and PAR output over traditional HPS bulbs. DE bulbs emit more UV and IR light than traditional single ended HPS bulbs, increasing the potency and essential oils of oil producing plants. Use with SUN-904904 or SUN-904910 double ended reflectors. Must use with either electronic or digital ballasts. Do not handle with bare hands. Oil from your hands can damage the lamp.