Save 3,880 kWh of electricity that is enough energy to light the average home for approximately one year and ten months while helping the environment to reduce greenhouse gases. It uses 75% less energy by replacing a 120 Watt light bulb with a 23 Watt. It lasts five times longer than common light bulbs. Comes in a pack of 4 inside a 15" x 7.09 x 5.5" box.