Ultra Sun® High Output (HO) 600 Watt High Pressure Sodium (HPS) lamp has a Kelvin temperature rating of 2000°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. This lamp has been specifically engineered for horticulture applications. The Ultra Sun® HO lamps is high quality, features robust construction and has an excellent reliability at a competitive price.