Sunlite Halogen bulbs produce more lumens per-watt (LPW) and have a longer lamp life than standard incandescent lamps. You can lower operation costs by more than 3% by using fewer halogen lamps to produce a greater amount of light. These Double-Ended T3 bulbs can last up to 1.3 years with normal household use of 3 hours a day and display a brighter, whiter light than incandescent bulbs. This Sunlite 15-watt, RSC based, Double-Ended T3 bulb offers 195 lumens of brightness, a clear glass finish and has an average rated life of 15 hours. Great for portable lamps, ceiling fixtures, track lighting, showcase displays and most common lighting needs.