As a couple of rank (and windy) amateurs

Nick and I were talking about the need for red light (!) last night ...
His thought was the gels used for tinting stage lights etc. Apparently it comes as a sheet and is a bit tougher than cellophane. We were thinking of covers for torches but it could be adapted for the car interior lights.
As a suggestion and not intended to cause any offence - praps newbies such as ourselves could be prompted re such lighting (and any other) considerations prior to committing any faux pas?
My apologies if such info is covered somewhere on the site (ie. read this before coming to a star party!) - my young apprentice limits my study to a considerable degree ...