Christmas lights string by Topelcom, with 100 led lights. 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. They have IP65 protection, which means they have complete protection against dust, while water propelled with great force (e.g. pressure hose) cannot enter. You can extend their length by connecting them to other bulbs.. They operate with electricity.