There is a kind of light that will shine, just like electromagnetic waves. What is light?

All light bulbs can emit visible light and invisible light, so they are called electromagnetic waves because they are all specific frequency bands of electromagnetic waves.

According to your original intention, you should not mean visible light, but invisible light.

Ultraviolet lamp with frequency greater than visible light is mainly used for sterilization, so it is also called ultraviolet germicidal lamp. Of course, ultraviolet rays also have fluorescent effect, so fluorescent powder can be used to test the authenticity of banknotes, so it is also called ultraviolet banknote inspection lamp. The principle of ultraviolet fluorescence has been used for a long time, such as mercury lamp. The traditional mercury lamp excites the inert gas in the lamp by voltage, then excites mercury, then emits ultraviolet rays in the spectrum, and then hits the phosphor to produce visible light, so it is also called electroluminescence.

Infrared lamps and far infrared lamps with frequencies less than visible light are often used as heaters and physical therapy devices, such as small solar energy, yuba and infrared physical therapy devices, due to their obvious thermal effects. Generally, it has a certain effect on losing weight. Far-infrared lamp can also be called fat-dissolving lamp.