FL-D filters are used to correct for the greenish tone that appears when shooting daylight film under fluorescent lighting.
An FL-B filter is used to correct the color balance when shooting tungsten film under fluorescent lighting.
Fluorescent lamps burn at many different temperatures and often require more demanding filtration for exact results. For specific filtration and professional use, it is strongly recommended that a color temperature meter be employed along with Color Correction filters (i.e.CC30M) when shooting under fluorescent lighting. This is the only proven way to achieve exact color correction.
Pleasing skin tones under fluorescent lighting without flash
True-to-life color rendition
Essential in any environment where ambient light source is fluorescent