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When introducing LED UV curing machines, we often refer to them as cold light source curing machines. However, some customers may ask, “The LED UV curing machine generates heat during use, so how can it be a cold light source?” In fact, the classification of LED UV curing machines as cold or hot light sources is not defined by temperature, but by the way electrical energy is converted. Devices like LED UV curing machines, which directly convert electrical energy into UV light (ultraviolet light), are typical cold light sources. In contrast, curing methods that first convert electrical energy into thermal energy, and then thermal energy into light energy, are called hot light sources.

What we call a cold light source is actually a light-emitting source that contains almost no infrared spectrum, distinguishing it from hot light sources that do contain the infrared spectrum. An LED UV curing machine is a cold light source because the light it emits is almost entirely visible light.

So why does the LED UV curing machine still generate heat? That’s because only about 30% of the electrical energy of the LED light source is converted into light energy, while the remaining energy is converted into thermal energy, which must be dissipated through heat conduction. Therefore, the LED UV curing machine does emit heat.