I read that many high pressure sodium and high pressure mercury street lights are being replaced with much more efficient LED lights, which fortunately point downwards instead of sending light sideways at star gazers like me, or into the sky where it refracts back down and hazes over the stars and galaxies. Many people want broad spectrum lighting for good color rendition. I wonder if they would agree to compromise with a three way mix of monochromatic red, green, and blue light, so they still get white light, but astronomers can filter out each of the three peaks. Our filters stand no chance against broad spectrum lighting. What if they had a mix of red, green, and blue LED's, which mix to white light by the time it hits the ground. Is there an efficient way to make those colors? I know low pressure sodium makes almost monochromatic yellow light, but it is not as efficient as the broad spectrum LEDs. Does anyone know how LED light is made and if the compromise is efficiently possible? Thank you.