What are the different light sources?
There are many light sources and here are some of the more commonly used ones: – A = Incandescent light or tungsten filament lamp – B = Simulated noon sunlight – C = Simulated overcast sky daylight (North sky daylight in the northern hemisphere) – D50 = D5000 = Warm indoor daylight – D65 = D6500 = Similar to illuminant C but with more of the UV component – F = Cool white fluorescent light Illuminants are often referred to with a temperature subscript. The temperature refers to heating a black body until the desired radiation is achieved. These temperatures are expressed in kelvins (K). For the equivalent temperature in Centigrade scale add 273.15 to the kelvin number (0°C = 273.
