Christmas lights rain by XMASfest length 1.1m and height 80cm, with 100 led lights, with a thickness of 3mm. They are green cable and emit cool white light, which is measured on the Kelvin scale with values from 5000K to 6800K. The tones of cool white are more blue compared to natural light. You can extend their length by connecting them to other bulbs.. They operate with electricity.