Hotter _incandescent_ bulbs (e.g. tungsten wire, halogen, etc.) produce more light than cooler ones, but the heat is still wasted. That's why such bulbs are going away.
With non-blackbody bulbs (e.g. florescent, LED, etc.) the light is produced directly. Any extra heat is still wasted, but we can (and do) engineer to reduce it, thus making the bulbs far more efficient.
