Tungsten balanced lighting and film stock are designed to work at around 3200 degrees Kelvin. It gets its name from the color temperature of light emitted by the tungsten filaments in typical incandescent film lights. This is in contrast to fluorescent and LED light sources, which can emit light at various other temperatures.
When shooting with tungsten-balanced film, tungsten-balanced lighting should be used to ensure a consistent white point in the resulting footage.
In modern digital video work, setting a specific on-set temperature is less important since a white point can be set during the debayering process in post. Nonetheless, rating lights as daylight or tungsten still ensures consistency in the lighting across the set.