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The efficacy of this product It can provide all the light that plant needs to grow and flower, can help plant grows quicker and better, increase yield. It's simple. High yields, low heat and low power consumption. Supplement sunlight, especially in winter with shorter daylight. Increase the longer time for plant in order to trigger specific growth and flowering and help plants grow quicker, decrease growth circle. Warm to touch, won't burn plant . No high wattage cooling systems needed, 50%-70% saving in energy cost. Features: Promote plant growth Increase fruitage Extend flowering time Make the plant more colorful 280nm ~ 315nm influence on morphological and physiological processes is minimal 315 nm ~ 420nm chlorophyll absorbs less impact photoperiod effect, prevent stem elongation 420 nm ~ 500nm (blue) chlorophyll and carotenoids absorbed the largest proportion, the greatest impact on photosynthesis 500 nm ~ 620nm dye absorption rate is not high 620nm ~ 750nm (red) chlorophyll absorption rate high, has a significant influence on photosynthesis and photoperiod effect 750nm ~ 1000nm absorption rate, stimulate cell elongation, impact of flowering and seed germination > 1000nm converted into calorie. Product Info: Type: Grow Lights Length: 2.2in(56mm) Certification: CE,RoHS,CCC, FCC Body Material: ABS Plastic Power Source: AC Features: Plant growth lights, Simulated sunshine Light Source: LED Chips Width: 50mm(1.97in) Voltage: AC85-265V LED chip quantity and composition: 60 LEDs (44 LEDs Red + 16 LEDs Blue) Lumen: 500LM LED chip model: SMD3528 Light Angle: 120 Radiation area: 0.5 meters height 0.5 square meters Watt: 4w Size: 50*56mm(1.97*2.2in) Weight: 0.73oz(21g) Working Temperature: -20 to 50 Operating Humidity: 0% ~ 80%relative humidity Package included: 4PCS/Pack