Lights are components associated with an entity.
Lights can be attached to any of the entities of a given scene.
Lights are loaded by a LightManager system. If no system is able to load lights, there will be no lights in the scene except to one that can be attached to the camera.
The way lights are used in the engine is specific to the renderer.
A renderer must, in its initializeInternal method, create and register a lightManager system.
The system will receive fileData at loading and will be polled by the renderer to get light to render.

Light Manager

Loading lights

Light are loaded by the active file loader and transformed to a LightData vector in th FileData constructed by the loader.