Ceiling-installed lamp has housing in region of housing back wall enclosed by annular lighting device with mounting for accommodating ballast

摘要: A ceiling-installed lamp has an annular lighting device (15) located in a housing (2) and one or more ballasts (7) to operate the light. The region of back wall (5), enclosed by light, apparatus mounting (6) for accommodating ballast, recessed from its outside inner chamber housing. . This recess appears as body (12) surrounded corresponding shape largely device, projecting into chamber. Its surface pointing is part photometrically effective reflection