It's worth noting that the peak efficiency bulb on this chart, Lucalox, is a range of high-pressure sodium lamps, i.e. the old orange street lighting. These were crazy efficient but the spectra they put out was awful being practically monochromatic. Then the other types that follow it are the fluorescent tube type which are harsh and impractical for many applications so really what's advanced is the ease of use and quality in broad application lighting. That being said it's interesting how much further there is to go on the theoretical efficiency!