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 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!