enum Luminance { DimGlow = 1, LEDPanel = 2, LEDScreen = 3, CellPhoneScreen = 4, CRTTelevision = 5, LampShadeExterior = 6, LampShadeInterior = 7, DeskLampLens = 8, HalogenLampLens = 9, FrostedBulb = 10 };