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constant current or constant voltage led driver, Amazon.com: Chanzon LED Driver 1500mA (Constant Current Output) 18V-39V (In:100-240V AC-DC) (6-12) x5 30W 40W 50W 60W IP67 Waterproof High Power Supply 1500 Lighting Transformer for 50 W COB (Aluminium) :, LED Power Selectable Constant Current LED Driver | | Dimmable