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Comment by supernumerary | Hacker News Reader

Regarding chicago this: https://en.wikipedia.org/wiki/Double_Cup

Regarding a city that's already done this - Detroit went full LED this year:

http://www.mlive.com/news/detroit/index.ssf/2017/01/led_ligh...

The difference on the ground is quite noticeable, partly because we're so used to sodium yellow and as LEDs are in the 6000K range - i.e. daylight ... it's 'uncanny', things certainly seem more HD - here's a picture I recently took at night:

https://iainmait.land/img/photos/1280/street_crossing_2_2017...

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You can get "warm" LEDs too. Got some for our bathroom after I realised the "daylight" ones were waking me up too much at night.

For bathroom lighting at night, red would be ideal. You can see but it won't really wake you up.

I light my apartment with red or orange LED strips in the evenings. It's much easier on the eyes.

This is where smart lightbulbs - like the Hue - are great. The allow to tune the color temperature and the brightness according to the situation. In my bathroom at night, the light comes on only to 50% and at a much warmer tone. For my living room, I have a pure dark red setting, whenever I plan to do some stargazing.

I have migraines and I use Hue to control temperature. I find the cooler the light (blue, white) the easier it is on my headaches, where the warmer (yellow, orange) light makes me feel like I'm squinting, or in a daze and not fully awake. With Hue I can change just the area of the house I'm in to cool white and my wife can have her yellow warm glow everywhere else.

I use UV for my lighting because red/orange tends to be too bright for me. I do wonder if this has negative effects on my quality of sleep though.

The white LEDs make me think of housing projects since they often have brighter non-sodium flood lights (to deter mischief ), in contrast to the next block over which would have sodium.

>LEDs are in the 6000K range - i.e. daylight ... it's 'uncanny'

The OP article is about how Chicago is using 3000k lights so they're warmer - the cooler option was 4000k.

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