While natural light is produced by the sun, artificial light sources can include incandescent bulbs, fluorescent tubes and light-emitting diodes (LEDs). Sunlight contains all the colors of the spectrum, which is necessary for photosynthesis in plants. Natural light sources include the Sun and stars. Artificial light sources include lamp posts and televisions. Without light sources we could not see the world around us, however not every object we can see is a light source. Many objects simply reflect light from a light source. In contrast, artificial light is human-made and can emanate from sources including fire, candlelight, gaslight, electric lamps and so on.
