I made my street scene and while making the lamps I had the idea to actually light them!
It took a while to work out, but since I’ve used Unity a bit before I got the hang of it quickly.
If you want to do this, in the lamp prefab, go to GameObject > Light > Spotlight. This will create a new light that you can modify. Move it to the light source of the lamp, and then change settings to give the desired effect. I changed the “Spot Angle” to 158.4, the “Range” to 18.3 and left the other settings the same as default. This should give you a nice looking street!