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The "K" in 4057K bulb stands for Kelvin, which is a unit of measure for color temperature. It indicates the color appearance of the light emitted by the bulb, with higher Kelvin values corresponding to cooler (bluish-white) light and lower Kelvin values corresponding to warmer (yellowish-white) light.
K is the chemical symbol of potassium.
F17 on a fluorescent bulb packaging typically indicates the type of bulb and its wattage. In this case, "F17" refers to a T8 fluorescent bulb that operates at 17 watts.
Potassium (from Neo-Latin kalium)
In chemistry, "K" can also stand for the equilibrium constant, which is a measure of the ratio of the concentrations of the products to the concentrations of the reactants at equilibrium in a chemical reaction.
In the periodic table of elements, the symbol K represents potassium. It is the 19th element on the periodic table and is an alkali metal with the atomic number 19.