I found this thread: 2D light not working in LWRP on mobile - Questions & Answers - Unity Discussions
However it is a (little bit) outdated, i think. The lights work very well in the editor, but when I export the project to mobile (android), all lights are gone and the scene is flat. Note, I’m using a 2D renderer, with LWRP aswell as light2d for my lights. Anyone else got this problem?