For street lights, it might be interesting not to have "white" LEDs but rather a combination of single-line red, green and blue LEDs. Without the phosphor, they

For street lights, it might be interesting not to have "white" LEDs but rather a combination of single-line red, green and blue LEDs. Without the phosphor, they should be more efficient, and it would help handling the light pollution for astronomy, as one could use selective filters. It would also make it trivial, to get the desired color temperature by balancing the three colors.