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Warm white ≈95 3000 941 Cool white ≈95 4100 950 Natural Daylight ≈98 5000 965 Cool daylight ≈95 6500 Special purpose tubes Numeric code Alphabetic Code Fluorescent lamp type Notes 05 N/A Germicidal lamps: No phosphors used in these lamps at all, and the enveplope is made of fused quartz instead of glass.
daylight fluorescent F2 0.37208: 0.37529 0.37925: 0.36733 4230 cool white fluorescent F3 0.40910: 0.39430 0.41761: 0.38324 3450 white fluorescent F4 0.44018: 0.40329 0.44920: 0.39074 2940 warm white fluorescent F5 0.31379: 0.34531 0.31975: 0.34246 6350 daylight fluorescent F6 0.37790: 0.38835 0.38660: 0.37847 4150 light white fluorescent F7 0. ...
Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]
cool white fluorescent F3 0.40910: 0.39430 0.41761: 0.38324 3450 white fluorescent F4 0.44018: 0.40329 0.44920: 0.39074 2940 warm white fluorescent F5 0.31379: 0.34531 0.31975: 0.34246 6350 daylight fluorescent F6 0.37790: 0.38835 0.38660: 0.37847 4150 light white fluorescent F7 0.31292: 0.32933 0.31569: 0.32960 6500 D65 simulator, daylight ...
Fluorescent lamps convert more of the input power to visible light than incandescent lamps. A typical 100 watt tungsten filament incandescent lamp may convert only 5% of its power input to visible white light (400–700 nm wavelength), whereas typical fluorescent lamps convert about 22% of the power input to visible white light. [32]: 20
Warm white compact fluorescent and LED lamps 3200 K Studio lamps, photofloods, etc. 3350 K Studio "CP" light 5000 K Horizon daylight, Tubular fluorescent lamps or cool white/daylight compact fluorescent lamps (CFL) 5500–6000 K Vertical daylight, electronic flash: 6200 K Xenon short-arc lamp [10] 6500 K Daylight, overcast 6500–9500 K