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2. GU24 lamp fitting - Wikipedia

   en.wikipedia.org/wiki/GU24_lamp_fitting

   The design was initiated by the U.S. EPA and the Lighting Research Center in 2004, in order to facilitate the deployment of compact fluorescent light bulbs with replaceable ballasts. [ 1 ] The GU24 fitting is compliant with a 2008 ruling by the California Energy Commission under Title 24 ( California Building Standards Code ) to require high ...

3. Color temperature - Wikipedia

   en.wikipedia.org/wiki/Color_temperature

   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

4. Lightbulb socket - Wikipedia

   en.wikipedia.org/wiki/Lightbulb_socket

   GY6.35 & GZ6.35 – same as G6.35 and only denote what lamp mount clip is needed to hold the actual light bulb in place; G8 – 8 mm (0.31496 in) pin spacing GU8 – same as G8 and only denotes what lamp mount clip is needed to hold the actual light bulb in place; GY8.6 – 8.6 mm (0.33858 in) pin spacing; G9 – 9 mm (0.35433 in) pin spacing

5. Fluorescent-lamp formats - Wikipedia

   en.wikipedia.org/wiki/Fluorescent-lamp_formats

   Ballast-swap replacement for 8 ft T12 75 W single-pin T12: 1.5, 38: 4 "25" F40UTSL Retrofit replacement for 4 ft T12 40 W on underpowered residential-grade rapid start magnetic ballasts. These are F40CW lamps made with lighter cathodes that can only handle a lower amount of power.

6. Bi-pin lamp base - Wikipedia

   en.wikipedia.org/wiki/Bi-pin_lamp_base

   The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...

7. Standard illuminant - Wikipedia

   en.wikipedia.org/wiki/Standard_illuminant

   Illuminants A, B, and C were introduced in 1931, with the intention of respectively representing average incandescent light, direct sunlight, and average daylight. Illuminants D (1967) represent variations of daylight, illuminant E is the equal-energy illuminant, while illuminants F (2004) represent fluorescent lamps of various composition.