Fluorescent lighting is one of the most difficult lighting sources to shoot under. Technically, what should be used is a "FL-W" filter to convert fluorescent light to tungsten balance, which is a slight amber colored gel. That said, it is more difficult nowadays because "fluorescent" lights can have numerous color casts...and they're often mixed together (e.g. "Daylight" tubes mixed with old-school ones, along with "warm" ones closer to tungsten)... making it very, very difficult to balance when shooting. The other challenge is that fluorescent lights flicker on a cycle, so if you shoot with any shutter speed over 1/45, you will get inconsistent exposures and color balances.
The good news is that if you shoot with CineStill 800T without any filter and overexpose a stop or two, it is not too difficult to color balance while scanning if proper care is taken. When shooting 800T in fluorescent light, we recommend metering as if your film is ISO 200 or 250 with a shutter speed of 1/45 or below. This will give you more information in your negative to pull out good color when scanning or printing by adding the correct amount of magenta and balancing your yellow/blue.
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