Depending on acceptable bandpass and desired color temperature, a white light has a maximum luminous efficacy of 250–370 lm/W. Nichia currently offer a white LE

Depending on acceptable bandpass and desired color temperature, a white light has a maximum luminous efficacy of 250–370 lm/W. Nichia currently offer a white LED that achieves 210 lm/W at >80 CRI. Cree have high-flux LEDs capable of ~200 lm/W at >70 CRI. There's room for improvement, but nothing revolutionary. Cree had a prototype device achieving 303 lm/W in 2014, but it isn't currently commercially viable. Lower efficiency LEDs still make up a large proportion of the market for simple reasons of cost. https://arxiv.org/pdf/1309.7039.pdf https://arxiv.org/pdf/1309.7039.pdf https://www.nichia.co.jp/specification/products/led/NF2W757G-F1-E.pdf https://www.nichia.co.jp/specification/products/led/NF2W757G... http://www.cree.com/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/ds%20XPL.pdf http://www.cree.com/~/media/Files/Cree/LED%20Components%20an... http://www.cree.com/News-and-Events/Cree-News/Press-Releases/2014/March/300LPW-LED-barrier http://www.cree.com/News-and-Events/Cree-News/Press-Releases...