I bought a life time supply of 100 watt bulbs. We don’t often use them, so it’s not as bad as it sounds. But we sometimes use them for heat for things like plants outdoors that might be killed by really freezing temps, or maybe an engine that needs a little warmth in order to start in the AM.
Those 100 watt bulbs are nearly 100% efficient as heaters. If they were marketed as such, they would get an EnergyStar award.