My reference to blue-enriched is just a reference towards deliberately blue shifted white light. Don't be so sly. There are no studies showing any definitve improvement in real world driving conditions of higher CCT LEDs like 5000K over lower CCT light such as 3000K LED. Furthermore, this study by UMTRI showed no improvement in driver seeing ability with higher color temperature lights. Additionally, research conducted at the CLTC at UC Davis showed the same thing.We're not talking about blue-enriched white light, whatever that's supposed to mean.
During EPIC-sponsored CLTC laboratory activities, a broad range of products between 2,200 K and 6,500 K has demonstrated that similar color rendering, discrimination, and visual acuity can be achieved.
With the research I linked above, higher color temperature lights do not provide any significant improvement in real world driving conditions. However, they do increase glare.
No, no it doesn't. The study you linked compared two extremes, spectrally deficient 2100K HPS and white MH. It did not show or quantify any improvement in seeing ability when comparing lower color temperature white light. In fact, as far as I can see, it didn't even quantify the "improvement" in seeing ability of MH. It also didn't mention the color temperature or SPD of the MH lamp.Now here's where it gets interesting.
No, San Diego adopted 4000K induction, and they still install 4000K LED to this day along major streets.The study you linked to appears to be designed to support what was already a foregone conclusion,
Not supporting studies but ok.based on my personal experience
And I remain convinced smoking in public spaces isn't a bad thing, but ultimately that and this aren't backed up by research. Obviously, I'm being sarcastic, but the point stands.We have written about the debate over LED street-light color temperature or CCT. I remain convinced that cooler CCTs, perhaps in the 4000K range, are optimum because I believe we see better at night under such conditions.