TY - GEN ED - BRITISH STANDARDS INSTITUTION TI - BS 4533 : Pt. 1 : Section 1.1: 1971 : Specification for electric luminaires (lighting fittings) - pt.1 : general requirements and tests- section 1.1 : definitions PY - 1971/// CY - London PB - British Standard Institution N1 - STD1514 ER -