Ultra Sun Dual Arc HO HPS / MH 1000 Watt (12/Cs) Ultra Sun® 1000 watt High Output (HO) High Pressure Sodium lamp delivers 1,850 µmol. Particularly impressive for a mogul base lamp. These lamps have a Kelvin temperature rating of 2,000°K (Dual Arc 1000 HPS/MH has a rating of 2,500°K) which is ideal for the fruiting and flowering stages of plants. With an improved level of PPFD, it is also an excellent lamp for full term plant grow... This item is sold individually. — Ships from H: WA, CA, CO, MI, TN, PA, FL USA....more info.