Recently F&V announced an upgrade to their Ultracolor and Plus series of LED panels that allow light shaping accessories like grids, barn doors or diffusers to be quickly attached and detached. These consist of frames that are clipped on and off the lights in a matter of seconds.
New panels will come with the system as standard. Older K4000 panels can be upgraded to the new quick release system and get a diffusion filter for free, if the user pays for carriage back to F&V’s European HQ. This seems pretty generous on F&V’s part.
Keep an eye on the F&V website for more details.