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No, sodium vapor lights offer great performance in terms of contrast and visibility. Especially in bad weather conditions.


Yes but that's the point: sodium vapour offers worse peripheral vision, so it could make some situations riskier.


no way, once something is into your periferal vision while in a moving car it's too late, and fact does not matter....unless it's moving realy realy fast, and then it's still too late so the real equation will involve all sorts of other inputs, like the coulor temp, and amount of direct vs reflected light, background light conditions, weather, and indivual perception of any given driver. *green light is the worst, as our eyes have the greatest sensitivity to it, and out night vision adaptation is to the black and white(muted coulor) light that is natural. current regulations are ancient, but there is no reason that a non opiniated solution cant be figured out and implimented


> once something is into your periferal vision while in a moving car it's too late, and fact does not matter.

When you're looking up in your rear view mirror, your view of the road ahead is from your peripheral vision. It most definitely does matter.


I dont think you know what peripheral vision is.

Anything outside of paracentral is considered peripheral. Paracentral is an 8 degree visual field. That’s a tiny potion of your forward vision.

When you are driving down the road that means the sidewalk is in your peripheral vision until around 25 metres ahead. If that’s too late for you to notice something then you probably shouldn’t be driving - at 50km/h, every metre after 25m before you notice a human hazard is 5% more likely to result in a fatality.

https://en.m.wikipedia.org/wiki/Peripheral_vision

Edit: downvotes for what, exactly?


I feel like nobody here ever drove in San Jose at night prior to 2020-ish. Because high-pressure sodium I like, LPS as in San Jose is like viewing a monochrome monitor.


Higher contrast isn't strictly better. Street lights where I live are deliberately sparse to limit light pollution, but this means that some of them are sometimes too bright— since the whole road isn't suffused evenly with light, very bright lights are somewhat blinding, especially to light sensitive people.


LEDs are much better for this since you can get tailored light thrown by angle to even out the lighting a lot more


Thanks for sharing this! I don't know much about light and didn't realize such a thing would possible. This seems like a great technique for cities like mine that want to limit light pollution.




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