An LED road light has a heat sink embedded with an LED module, a base and a light pole holder assembly. The EUV mask includes a first state and a second state different from each other; a first main polygon and a second main polygon adjacent to the first main polygon; a plurality of sub-resolution assist polygons; and a field. Diagnostic control circuitry 12 is provided which is responsive to current values of the virtual machine identifier, the context identifier and at least one of the one or more associated memory addresses to trigger the diagnostic circuitry 10 to perform diagnostic operations. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. As another machining method, dry etching can be used for machining the positioning projection or groove. According to the present disclosure, charging differences between different colors of sub-pixels can be reduced.