These bulbs are made of brass as shown for optimum outdoor use and have a filament life of 2500 hours. Typical 7.5 watt light bulbs usually have an aluminum base and are rated for 1,400 hours of use, which costs twice as much as a single light bulb. When illuminating interior spaces, including the garage, they surpass traditional incandescent lamps in quality and durability. Depending on the hourly usage per day, you can get eight hours per day or more if less for up to a year. All my light…