Sunlite 66150-su 20mr11/cg/gu4/nfl/12v/sb 20w silver back mr11 mini reflector halogen bulb, gu4 base sunlite halogen silver back mr11 mini reflector 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, gu4 based, silver back mr11 mini reflector bulb offers a light output of 750 cbcp, 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.