A transformer core portion (110) for a power transformer (100) housed within a cylinder shaped light fixture is provided. The power transformer (100) includes a transformer core portion (110) that includes the first and the second core portions (115). Each of the first and second core portions (115) includes an approximately half-cylinder shaped top surface (117) and an interior space for housing a wire wound bobbin. The power transformer also includes a bobbin base (120) housed within the first and second core portions (115).
