A Tiffen FL-B filter is used to correct the color balance when shooting tungsten film under fluorescent lighting. 

This filter is glass and measures 75 x 100 mm (3x4") x 4 mm thick.

NOTE: The FL series of filters alone does not always guarantee 100% correct color balance when shooting under fluorescent lighting. They are general purpose filters intended for moderate correction and will not, by themselves, necessarily provide perfect color rendition.

An FL-W filter is used to balance daylight film under warm white or white type fluorescent lamps. An FL-D filter is used when you wish to correct for the greenish tone that appears when shooting daylight film under general purpose 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

Related Questions and Answers

Q: 1. Is the filter a flexible gel or a rigid material?

A: This is a rigid, acrylic Tungsten Filter. The exact specifications are: Optically clear acrylic panel. Converts 5500 degrees Kelvin to a nominal 3200 degrees Kelvin.

Q: 2. can these be used to warm up par 38 led bright white floods?

A: Yes these CTO filters can be used to warm an LED light source with a cooler color temperature.

Q: 3. Does this use a ballast?

A: No.

Q: 4. Are the filters marked as 1/8, 1/4, 1/3, 1/2, 3/4 and full CTB? If not is it clear that these values are included in this collection?

A: The gels are marked with a label. Included in the kit are: 2 x 720 Durham Daylight Frost 2 x 203 Quarter CT Blue 2 x 201 Full CT Blue 2 x 218 Eight CT Blue 2 x 202 Half CT Blue 2 x 200 Double CT Blue

Q: 5. can these be used on a 650w or 1000w tungsten fresnel light?

A: Yes you can if you attach it to the barn doors

Q: 6. Trying to assess the power output of the 200W units - currently running Einsteins at 14.1 WS, ISO100, F6.3, 1/250th into 2 1x3 softboxes - would I be able to use similar camera settings (headshots). Or another way of asking this is how powerful are these when used with a 1x3 softbox vs. the Westcott Flex 1x3's?

A: 200 watts of LED output is similar to maybe 75-100 watt seconds of Flash output.

Q: 7. How do these hold up compared to brands like LEE or ROSCO?

A: These are all very similar gels that will hold up to heat.

Q: 8. Anyone have a light meter reading on this? Say 100 iso, shutter 60, f 2.8 at 10 feet with standard reflector?

A: You should be able to get a reading of 30,000Lux at 1m.

Q: 9. Are these heat resistant?

A: They are heat resistant to some extent. However, it's recommended to allow for at least 2-3 inches of air space between the gel and the light.

Q: 10. Will this fit on my 5000 Stella?

A: This will not fit the Stella 5000