Infrared Heat Lamps
An infrared heat lamp uses a special form of incandescent light bulb primarily to produce heat rather than to generate light. These lamps do produce some light, but most of the energy they produce is directed towards heating the room.
The incandescent bulb or bulbs in the lamp produce heat by generating infrared light. Normal light bulbs are designed to produce light and the heat they generate is considered to be waste. Conversely, the light bulbs that are used in heat lamps are intended primarily to produce heat, with the light being essentially a waste product.
Infrared heat lamps are relatively energy efficient so they do not use up too much power. However, they are designed to be used to provide some extra heat in your bathroom when it is needed, rather than to be left on for a long time. It is best to avoid using these lamps as the only source of heating in your bathroom, or to rely on them as a source of light, as well as for heating. Ideally, the infrared heat lamp should be installed with a switch that can be used to control it separately from the lighting in the room, and turned on as needed.