Even the brightest bulbs will eventually burn out and need to be replaced. The STEELMAN 12100 is a replacement bulb for the 16-Inch Pro Bend-A-Light part number 10150A. Using the same type of high intensity bulb as the stock Bend-A-Light it provides the same level of bright, long lasting light for far longer than a traditional bulb could manage. The bulb comes built-into in a plated brass and plastic fitting that is threaded so that installation is quick and painless, getting you back to work fast. Retaining the same 5/32-inch diameter as the original bulbs it has an approximate continuous burn time of 4-hours. Can also be used in the STEELMAN 16102 Mini Pro Bend-A-Light.