The brand I found when I did the research was LightDims. They seem to come in pretty large sheets. Haven't actually ordered any though.
Yeah, I'm also PWM sensitive. You can buy devices which measure it fortunately but I've been making do with a phone camera on a high/brief shutter speed.
Yeah, I'm also PWM sensitive. You can buy devices which measure it fortunately but I've been making do with a phone camera on a high/brief shutter speed.