The 201 Full Color Temperature Blue Filter from LEE Filters is uniform in color and with a mired shift value of -137, can be applied over a light fixture to purposely create a cool cast over a scene. This filter is constructed from polyester that is heat resistant to 356°F.

This filter is useful for converting tungsten light sources with a color temperature of 3200K to 5700K photographic daylight. Under 3200K tungsten light, the 201 Full Color Temperature Blue Filter exhibits a 0.46 density and transmits light at 35%. Under 6774K Source C light, it exhibits a 0.47 density and transmits light at 34%.