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Samsung QB288 quantum led lamp board lm281B+ 3000K 3500K 5000K 660nm uv ir with 120w aluminum radiator diy plant develop smooth Samsung QB288 lm281b+ quantum led Grow lamp boards LM301H 3000K/3500K+660nm+UV+IR board : Power50-120 WattsVoltage Range48VLED248pcs Samsung lm281B+32pcs 660nm+4pcs UV+ 4pcs IRFlowering Footprint4&;X4&; or 5&;X5&; (2 kit)Veg Footprint6&;X6&; (2 kits)System Efficiency160 Lm/WDimensions286mmX174mmRecommended Mounting Height20-32 inches Pre-drilled heat sink for one QB288 boardSize:326*195*10mm Weight: zero Watt: for 120W