The different categories of light: natural lighting and artificial lighting. Natural lighting comes from sunlight, which varies throughout the day and seasons, providing a dynamic and energy-efficient way to illuminate spaces. On the other hand, artificial lighting is human-made and ranges from incandescent bulbs to modern LED technology. Artificial light is versatile, allowing us to control brightness, colour temperature, and placement to suit specific needs, whether for functionality, ambience, or decorative purposes. 

Lighting is one of the major agents of decay to objects. Have you ever noticed certain fabrics in direct sunlight fade? Or red cars turn pink? These are due to UV rays aka sunlight. The same principle can be applied to museum objects. So it is important to keep the artefacts away from harmful rays, while still keeping them viewable to the public.