Infrared light immediately follows red light on the electromagnetic spectrum. Infrared (IR) light energy is broken down into three groups:
- Near Infrared, also called infrared A (IR-A). Near IR spans wavelengths 760 to 1,400 nm. Most home therapy devices use these wavelengths.
- Mid Infrared, also called infrared B (IR-B) – These wavelengths are used in many household electronic devices such as remote controls.
- Far Infrared, or IR-C– also known as long wave infrared , thermal infrared (thermal-IR). This is the largest part of the IR spectrum, used in infrared saunas.