Cool, Balanced Light: Premium VIVOSUN T5 lamps emit a balanced red and orange spectrum at 3000K to enhance budding and fuel a bountiful harvestLong Lasting: The average recommended usage life is well over 20,000 hours, exceeding the lifespan of almost any HID lampGentle on Foliage: 54 Watt bulbs put out 5000 Lumens, nourishing tender buds and foliage safely even at close range and in cramped spacesEconomical: VIVOSUN T5 lamps are cost effective an efficient; Also, very low heat emissions reduce or eliminate the need for expensive ventilation and air conditioning