Ultra Sun® HPS HO Lamp With a Kelvin Temperature rating of 2000K, The Ultra Sun High Pressure Sodium High Output Lamp, is ideal for fruiting and flowering stages of plants! This lamp has an improved level of PPFD (Photosynthetic Photon Flux Density) and is a great lamp for the full term growth of your plant. The Ultra Sun High Pressure Sodium High Output Lamp was engineered for horticulture applications specifically, and are made with high quality, sturdy and robust construction with reliability at a competitive price!