Many things make up the quality of light that a fixture emits. Size of the globe, type of filament, size of fresnel, etc. One type of fixture can be used to create the quality of light of another if it's in the right hands. "hotlights" is a pretty broad term since there open face, scoop, fresnel, open face with interchangeable lenses, and others. HMI fresnels have a different quality (besides color temp) of light than tungsten fresnels since the hmi doesn't have a filament which burns constantly.