Actually they aren't in terms of energy. High pressure sodium lamps output around 100 lumens per watt, which is the same as LEDs. I'd imagine some LED luminari

Actually they aren't in terms of energy. High pressure sodium lamps output around 100 lumens per watt, which is the same as LEDs. I'd imagine some LED luminaries are consuming more energy than the sodium lamp they replaced, as they are usually brighter and some will have terribly inefficient power supplies.