For a 555nm green light, peak efficiency is 683 lm / W, but for a high CRI white light the theoretical maximum is about 260-300 lm / W. High CRI costs lumens, since much of the total power must be spent on less-efficient wavelengths.
FWIW, here’s a stock light with 93CRI at ~5700K. 5000K is more common though, like in the BLF-348 and Zebralight “d” series.