What is the difference between a light bulb and an ordinary type?
The light in front of it will have infrared light, which will heat up the exposed material. That's about it. Hope helps.
In addition to the cold cup, a lot of the light cups are aluminum. Aluminum is a metal reflecting film, which is reflected in all wavelengths, including infrared.
The main difference is the coating of the lamp cup. The cold light cup is made of dielectric membrane, which is characterized by selective reflection and infrared reflection visible light. This way the light cup will not have the heat effect (relative), so it will be called a cold cup.
