Halogen light bulbs are a type of incandescent light that are more energy-efficient and longer lasting. Unlike traditional incandescent bulbs, halogen lights can be used in specialized appliances and tools, such as projectors, and can burn longer and hotter than their counterparts. They are typically used in landscape lighting, for retail, show cases, and for food service.Satco’s model S3602 light bulb uses 40W of power, with a brightness of 280LM lumens. It fits a Medium (E26) base, with a frosted finish. With typical use, it lasts about 1500 hours on average before requiring a replacement. This product is sold in multiples of 25.