I saw a comment on IG, I think it was Andy Millwards page. Someone asked about using the LED mask on clean skin because her face felt tight if she cleansed without moisturising. He replied that you can use it on clean skin eg after waking up in the morning before doing your morning routine. I can't find the comment now although I did find the one below.
ETA it's the FaceLite (which is identical to the CB, CB's just rebadged) which Andy uses himself, recommends and sells. He's a very interesting account to follow.
I have just bought the LED Hand mask and have started using it at the same time as my neglected face and neck/dec masks. Charged them all up at the same time and used them simultaneously. The face and neck masks still had plenty of charge left when the hand mask ran out of charge during the 6th use. I contacted Current Body and they explained that the hand mask has a smaller battery so can't hold as much charge. In case any of you wondered similarly.