To illuminate the object in the scene, you can use two kinds of light - spot and directional. You can set in the scene for more than one light, but remember that in the case of complex scenes (many triangles) bigger number of lights will visibly impact the efficiency. Until you add any light to the scene, the program sets the default spot light in the observer position.
Due to the specificity of the rendering engine work, the lights have a very modest settings. This is due to restriction on the OpenGL version used by Molehill. In fact, the only parameter for the light source is a Color.