Check out a nice quick guide by Andrii 'Zelfit' Mykhailov.
Andrii 'Zelfit' Mykhailov shared a new video guide to making fake reflections on low-poly headlights in Substance Painter. Basically, you will learn a nice little trick that will make your models shine.
The artist showed all the layers you need and covered parameters that can be customized. He used Substance Painter and Marmoset for baking, but you can bake using any other tool.
Looking for some headlight patterns? Andrii also released a set of 10 different fresnel patterns for Substance Painter. These patterns can be used to add height details on different headlights, searchlights, and more. You just need to add a fill layer with height channel and use them as a mask. Learn more and get the patterns for $2 here.