... , 15X1W, 18x1W, 21X1W, 24x1W *SMD3528 chip High brightness LED downlight series: 1.5W, 2W, 2.5W, 3W, 6W, 9W, 12W, 15W *Opening diameter(mm ... . Sample inspection: Product appearance access, component (LED chip and driver)test, finished product test(voltage, current, lumen flux etc. ). 3. Mass production ...