Which of the following is a common use for infrared lamps?

Infrared lamps are commonly used for heating due to their ability to emit infrared radiation, which directly warms objects and surfaces rather than heating the air around them. This characteristic makes infrared lamps highly effective for applications such as providing warmth in outdoor spaces, heating food in restaurants, and being part of heat therapy treatments in medical settings. Because infrared radiation penetrates the skin and warms the underlying tissues, it's also utilized in settings where a specific and efficient heating method is required.

While lighting, cooling, and signaling are important functions in various contexts, they are not primary uses of infrared lamps. Lighting typically relies on visible light sources such as incandescent or LED bulbs, while cooling appliances like air conditioners use refrigeration principles rather than infrared technology. Signaling, often involving visual cues, does not correlate with the primary function of infrared lamps, which are designed to produce heat.