With lower energy use and more light intensity than a standard 400W HPS, you'll see a higher yield, fatter flowers, and more trichomes with this unit. 84 high-output, 5-watt LEDs have glass lenses that are durable, easy to clean, and allow canopy penetration critical to the nourishment of lower leaves and flowers. Though it's designed for smaller grows, it can deliver up to 14 square feet of coverage for vegetative growth -- 9 square feet in the flowering phase -- of even, edge-to-edge coverage without leaf burn or hot spots. Unique Phyto-Genesis Spectrum® ranges from UVA to NIR (365-750nm) and delivers precise light during each phase of plant growth - no switching means no stalling. Boosts photosynthetic efficiency, increases flavonoids, antioxidants, and pigmentation. Large heatsink provides superior cooling and extends LED life; whisper-quiet fans have a lifespan of 70,000+ hours, LED bulbs 50,000+ hours. Includes two FREE heavy-duty, ratcheting grow light hangers. Mercury-free bulbs.