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Specifications: Item: 135W 165W SMD Led Grow Light Lamp Beads: Red and Blue Color: 135W: Red:Blue = 165:60 (SMD2835) 165W: Red:Blue = 1131:234 (SMD5730) Wattage:135W 165W Power Supply:AC85-265V Electricity: 300MA Operating Frequency:50/60HZ Service Time:about 50000h Dimensions: 135W: 310mm*310mm*35mm 165W: 310mm*310mm*35mm Irradiation Area: 1.5 Square meter Hang Height: 0.5 m-1m Here is how Specific wavelength works: 280~315nm: Less influence for plant's growth. 315~400nm: (UV)Absorb less chlorophyll, prevent stem growth. 400~520nm: (Blue): Absorb much chlorophyll and carotenoid, helpful for photosynthesis. 520~610nm: (Green): Absorb little chlorophyll. 610~720nm: (Red): Increase photosynthesis for plants, help growth. 720~1000nm: (IR): effect flowering and seed. >1000nm: Change to heat.