Erik Naso
Veteran
Hard diffusion have been around since the early LED units (1st gen lightpanels). If properly designed, they are very efficient. I've been using an industrial material that is designed specifically for LED's--the back side collects the light and the front diffuses, so the transmission is actually better than diffusion on the roll with similar softening capability.
Tough spun is a pretty inefficient diffuser. I'm quite surprised to see it mentioned so much on this board. I haven't seen it in use on sets for a good 25 years. I'd even go as far to say that we refer to it as a punch line!
You have a source for these white panels? I would like to experiment with them.