Halogen bulbs are available in almost every shape and size and produce a very attractive light which closely resembles sunlight. Halogen bulbs are filled with halogen gas which reacts with the filament to produce a much brighter and more useful light source. Halogen bulbs are also more efficient than incandescent bulbs. They use less energy and last longer. From medical and dental equipment to household and car uses, halogen bulbs have a wide range of applications and uses.