There was a physics chapter in high school which covered this basic stuff peeps.
It was probably mentioned already, but... lighting color temperature has nothing to do with whether a lamp is LED (or compact or linear fluorescent).
LED lamps come in basically ALL color temperatures from around 2000K (warm; orange) to 6000K (cool; bluish)
The fact that Chicago chose those very bright white, "daylight" 4000-5000 Kelvin LED streetlamps must have been a conscious choice for one reason or another. Probably nighttime vision/safety and cost concerns.
LEDs are NOT exclusively bright white.
There are LED lamps for ALL lighting fixtures, including streetlamps, which glow in a color exactly the same as incandescent or sodium vapor or metal halide, etc.
This is a VERY basic lighting color temperature depiction of the most common CCT values.
