Warm white LED is 2.4 lumens (2x) for added brightness. Each day, rays from the sun recharge the included NiCd battery. At dusk, the battery activates to turn on the included LED bulb inside the unit. Installation is simple and takes only a few minutes of your time. Just push the stake on the unit down into soft earth and allow to charge for a full day in the sun. Durable black plastic with "hammered" plastic lens.