VIVOSUN 2FT 24W 3000K T5 HO Fluorescent Tubes Warm White Grow Light Bulbs Pack of 5 COOL, BALANCED LIGHT: Premium VIVOSUN T5 lamps emit a balanced red and orange spectrum at 3000K to enhance budding and fuel a bountiful harvest LONG LASTING: The average recommended usage life is well over 20,000 hours, exceeding the lifespan of almost any HID lamp GENTLE ON FOLIAGE: 24 Watt bulbs put out 2000 Lumens, nourishing tender buds and foliage safely even at close range and in cramped spaces ECONOMICAL: VIVOSUN T5 lamps are cost effective an efficient. Also, very low heat emissions reduce or eliminate the need for expensive ventilation and air conditioning HIGH QUALITY UNITS, GREAT CUSTOMER SERVICE: VIVOSUN produces premium lamps backed by friendly and professional 24/7 after-sales support Length: 24&#039;&#039; (2ft) Power: 24W CCT: 6500K Luminous Flux: 2000 lm Color Rendering Index(CRI): 82 Lifespan: 20,000 hours VIVOSUN T5 grow light bulbs give vegging plants the light they need to grow strong and flowering plants the spectrum they need to make flowers bloom and buds blossom ; -COOL WHITE 6500K for veg ; -WARM WHITE 3000K for flower ; The florescent tubes are wrapped in bubble wrap and secured inside a  thick, extra-fortified cardboard tube. Shine 2000 Lumens down onto your plants per tube- brighter than other name-brand lamps All VIVOSUN T5 florescent tubes are HO (High-Output) tubes, which produce far more lumens than standard or HE tubes Constant brightness that doesn&#039;t flicker on and off ; With low heat emission and energy-efficient, your plants will love them ; It is perfect for commercial and industrial applications also :  Aquariums, greenhouses, propagation, germination, general office  lighting.