infrared
infrared light
infrared radiation
infrared emission

But about 10 percent of its infrared light does make it to Earth.

Infrared light can allow a patient's eyes to run a computer, close a door or answer a phone, the doctor said.

The only problem is finding a source of infrared light.

There are also special films which can record infrared light.

A single wave of infrared light is very low energy, cannot go through the human body, and can only warm it.

Infrared light is the most common heat transfer radiation in the dark.

Most applications, however, are in the range of the visible and near infrared light.

Humans cannot see infrared light, but we can feel the radiation in the form of heat.

Both people and machines were easily visible when seen by infrared light.

Infrared light is used in industrial, scientific, and medical applications.