A lumbar system for use in a seat includes a frame having a first side and a second side substantially opposite the first side, a pump mounted to the second side of the frame and operable to pressurize air, and a control module mounted to the second side of the frame. The clip is arranged at least partially at a side of the mainboard. Determining if the consecutive number of detected errors exceeds a threshold, and if the consecutive number of detected errors does exceed the threshold, identifying the first disk as a suspect disk. The present invention solves the problem of incapableness of performing the access control when the access controller can not directly use the authentication service provided by the authentication server. The optical recycling device spatially recycles a portion of rays of light emitted by the LED back to the light source using a reflector or mirror andor angularly recycles high angle rays of light and transmits small angle rays of light, thereby increasing the brightness of the light source’s output.