It is really common that people including me often purchase the light only consider that the light can be on. This is not quite wise since lights have different shape and it will bring different shine. Some are produced for the certain fixtures while other is working only for decoration. Some of the example for the working lights are Halogen, Xenon, and HID. In contrast, some of the example for decorating purpose are compact fluoresce which is dominated to produce unique light fixtures.