- 1Papers of the General Electric Company's Illumination Group (GECIG)
1925-1990, fonds - 2Collected papers of the Illumination Group (GECIG/A)
1926-1958, series - 3Binder entitled 'Collected Papers of the Illumination Group - Vol. II' (GECIG/A/2)
1936-1946, file - 4Folder entitled 'Collected Papers of the Illumination Group - Vol. I' (GECIG/A/1)
1926-1936, file - 5Binder entitled 'Collected Papers of the Illumination Group - Vol. III' (GECIG/A/3)
1946-1952, file - 6Binder entitled 'Collected Papers of the Illumination Group - Vol. IV' (GECIG/A/4)
1952-1958, file - 7Hirst Research Centre Lighting Group collected papers (GECIG/B)
1958-1975, series - 8Folder entitled 'H R C Lighting Lab. Collected Papers 128 - May 1958 to 180 - May 1969' (GECIG/B/1)
May 1958-May 1968, file - 9Folder entitled 'H R C Lighting Group Collected Papers 181-' (GECIG/B/2)
1970-1975, file - 10OSRAM-GEC research material (GECIG/D)
1938-1984, series - 11Album of photographs showing experiments relating to street lighting (GECIG/D/01)
11th July 1938 - 1st June 1939, item - 12Report entitled 'Special Lamp Production Section' (GECIG/D/02)
1975, item - 13Memos entitled 'Reports - Illumination Group' (GECIG/D/03)
1st June 1953, item - 14Booklet entitled 'A review of the development of ballasts and circuits for operting discharge lamps' (GECIG/D/04)
1969, item - 15Memo entitled 'Tw, ∆T and All That' relating to the insulation of electrical components (GECIG/D/05)
3rd December 1971, file