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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 at a competitive price.