This Crompton Lamps 15W LED GLS light bulb with a ES-E27 Edison screw (27mm) fitting is a direct replacement for a traditional 100W light bulb, but has the potential to reduce your home lighting bills and reduce the frequency of needing to replace your light bulbs. LED technology is much more energy efficient than traditional light bulb technologies such as incandescent bulbs. This not only helps you save on your energy bills but also helps the environment too. Whereas a traditional light bulb would use 100W to produce 1521lm, this LED version uses just 15W equating to an energy-efficiency of 101lm/W. This provides a substantial improvement over 100W incandescent light bulbs. This high-performance LED light bulb sports a lightweight thermal plastic shell that is specifically designed to dissipate heat very effectively. This reduces the light bulb's running temperature and places less strain on its components resulting in a longer life span. With a long life of 15,000-hours, this LED GLS light bulb boasts an incredible 8.2-year lifespan if used for 5-hours a day. These light bulbs don’t need to be replaced as often which results in less money spent on replacement bulbs, and less time spent replacing them, too. Warm white (2700K) bulbs produce a warm, yellow light which is comparable to traditional incandescent bulbs and are most frequently used to create a relaxed atmosphere. This makes them great in any room in your home, but especially in rooms such as the living room or bedroom where you would like to create a comfy atmosphere. This LED GLS light bulb will retrofit directly to any existing ES-E27 fixture; whether that be smaller domestic light fittings such as ceiling lights or floor lamps or up to large-scale commercial installations.