1,5years of life 50000 hours, 2,no flash,instant start 3,high efficiency 4,no flicker,no different sound 5.waterproof Voltage: DC 12V, 0.4W, Diameter: 45 x H6.5mm, Material: stainless steel, 1.0meter between each lamp, with one switch transformer(input: AC100-240V, output: DC 12V, 5.0W) 5w undergroud light