The lights are now working. It is possible to have point lights and directional lights. I also added shadows using a simple shadow map. For now, only one directional light can have shadows. I will try to improve this.
In the new video, I have one directional light casting the shadows and two point lights (yellow and blue) are attached to the ships.
After uploading this "ugly" video, I found this page https://support.google.com/youtube/answer/1722171?hl=en that explains how to push better quality videos. Here is the second try:
Next in the TODO list: do some clean-up and try to get more shadows...
Have a nice day.