You can also purchase gels- floppy plastic sheets of filtering material- for incandescents. The problem is that normal household lights are SO far down the Kelvin Color scale, that to filter them back to daylight would cut out SO much of the available light as to make them almost useless.
Yes, you can buy photofloods. They burn HOT, and don’t last long, but they deliver daylight. And, you can buy stuff like the Duro-Test full-spectrum light bulbs.
See, it’s not just the Kelvin Color scale rating, but the degree of spectrum. These guys make full-spectrum bulbs- GREAT stuff to work under 12 hours a day in an office. I shot a job at the factory years ago, wonderful stuff. Truly amazing.
Anyway. The film comercially sold in most places is, as mentioned, daylight color temperature. ( See the charts below). You can either filter the lens, or deal with the off-colored look.
Tungsten Light- 3,400 Degrees Kelvin
MOST Fluorescents- Cool White- 4,200 Degrees Kelvin
Daylight at high noon in North America ( for those in the know and feeling picky ) - 5,600 Degrees Kelvin
Household Incandescents- below 2,900 Degrees Kelvin. Brually “warm”. See, the higher the number, the cooler the light on film. For example, on an overcast day at dusk, I could get a reading of over 6,500 Degrees Kelvin on a color meter from the cold colored light left in the sky.
Et cetera.
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