What would be the good format to import into Blender?

I need to export some 3d data from my program (basically, several meshes and several light sources, no animation), import it into Blender, and then perform the rendering. I thought about using .blend format for that, but most places where I looked said that it was quite complex, and it would take a lot of time to implement exporting in it.

What format would work better for this task?