The IKBA-HMS400-B-PL is a linear polarizer for the IDBA-HMS400 LED light.
Most sizes of this polarizer are available in your choice of 'Type A' or 'Type B'. The orientation of Type A polarization is parallel to the light's longer axis. Type B is perpendicular to the longer axis.
For a complete solution, this polarizer should be combined with a linear polarizer (more correctly referred to as an "analyzer" in this configuration) that is mounted on the camera lens.
The image above shows a representation of the product family. The filter's length varies by model.
Orders for this item cannot be cancelled, nor returned. (Sorry, but this is the manufacturer's policy.)