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How does it work? 36 red LEDs: with wavelength 620-630nm, is more efficient and beneficial for photosynthesis. Red light is essential for seed germination, root growth, and bulb development at plants early stage. It also makes the plant yield better fruits when flowering.18 blue LEDs: with wavelength of 460nm, blue light is necessary for Chlorophyll and Carotenoid biosynthesis, enabling the plant to intake more energy, help for promoting the stem and leaf growth.Advice & Tips: Different kinds of plants need different illumination time. We should give plants corresponding lighting time according illumination intensity and their species. General, vegetables and flowering plants need 8-16 hours light time a day.SpecificationMATERIAL: Acrylic(PMMA)lampshade + Electroplated aluminumOperation Voltage: 5VRated Power: 27W Beam Angle: 120°Luminous Flux: 864LMProduct Weight: 1.2 lbs Life Time: >50000 hoursUSB Charging Line Length: 63 inchWavelength: Red: 660nm/Blue: 460nmPackage Included1 x Three Head LED Grow Light1 x User Manual1 x Power Adapter