A compliant micro device transfer head and head array are disclosed. A power supplier is coupled to the server for converting an input voltage into a first output voltage when the input voltage is normal and for providing the first output voltage to the server. The method for manufacturing the LED light bar and the LED light bar thereof according to the present invention use a graphene layer formed on a metal substrate and use silicone layers for planarization and heat transfer so as to effectively enhance heat dissipation performance of the LED light bar and extend lifespan of the LED light bar. Furthermore, an imaging method by depth calculations is provided, based on the attenuation of photons of different energies, which are emitted from the same source, coupled with position monitoring. The deflector receives the seat belt webbing and directs the seat belt webbing across the shoulder of the occupant. Each of the first, second, fourth and sixth lens elements has at least one aspheric surface, and one of the third and fifth lens elements is made of glass.