Sunlite 03258-su q20/fr/g4/12v 20w single ended t2.5 halogen bulb, bi-pin base, frost sunlite halogen single ended t2.5 bi-pin bulbs can last up to 1.8 years with normal household use of 3 hours a day and display a brighter, whiter light than incandescent bulbs. This 20 watt, g4 bi-pin based, single ended t2.5 bi-pin bulb offers a light output of 210 lumens, a frost glass finish and has an average rated life of 2,000 hours. Great for portable lamps, ceiling fixtures, track lighting, showcase displays and most common residential and commercial lighting needs. 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 30% by using fewer halogen lamps to produce a greater amount of light.