Rent this kit to narrow the beam angle on B1x lights. It comes with the grid adapter as well as 10, 20, and 30 degree grids, all contained in a handy travel pouch. Note: The diameter of the older B1 lights (non-"x") is slightly larger than this gel holder was designed for, so we don't recommend using it with those lights.
Important note: These grids will melt if you use the modeling light. You MUST turn off the modeling light if you're using this kit.