Ultra Sun? 1000 watt High Output (HO) High Pressure Sodium lamp delivers 1,850 ?mol. Particularly impressive for a mogul base lamp. These lamps have a Kelvin temperature rating of 2,000? 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 growth. These lamps have been specifically engineered for horticulture applications. The Ultra Sun? HO lamps are high quality, feature robust construction and have an excellent reliability at a competitive price.