|
I think something in this story has gone awry. Whilst I don't know the specific situation in Los Angeles, the situation in Davis, California was that the street lights have been retrofitted to a CCT of 1800K, there is approximately 2.5% blue in the spectrum, at 4000K there would be in well in excess of 10% and if the lights are described as white then there will be much more blue.
The blue spectrum cannot be filtered out. The concept (or practice) of full spectrum lighting has pretty much had its day, the future of lighting lies in spiky spectrums using lasers and narrow band LEDs.
The objective of managers of dark sky parks in Europe and North America tends to be installing 1800K, amber or pc-amber. I'd totally agree that the "warmer" light at lower CCT is much better for vision, that's not how everyone sees it. I am colour blind though. The existing research shows that the blue light component of many current white LEDs is offensive and annoying to people.
|