A radiant heater is provided, which is subdivided into three concentric areas and which can be mounted under a glass ceramic cooking area. The mounting assembly includes a swing arm assembly having two arms connected by an intermediate member with each of the arms having a pivotal connector attached to one of their ends. The first portion is formed of a first composition comprising a reinforcing filler having at least 40%-by-weight carbon black and at least some white filler, the second portion is formed of a second composition comprising a reinforcing filler having at least 20%-by-weight white filler, and the first composition is different from the second composition. The method then includes changing the implantation angle, and implanting another wafer with phosphorous ions.