TDP Heat Lamps are medical devices classified as far-infrared heating devices by the U.S. FDA.;The heat produced by our Infrared heat lamp does not utilize high heating temperature, yet still allows excellent Infrared penetration through the skin.;TDP works with coil heat and a mineral plate (no light bulb needed). The Mineral Plate (6.5 in diameter, life span of up to 1,500 hrs) emits Far Infrared Rays when heated.;Please wait at least 10-20 minutes for heat. Typical treatment sessions should last a minimum of 40 min per area.;Detachable head - simply unplug the cord that connects the head and the main frame when replacing.