Quote:
lens gels

This isn't really aimed at you, but I've never worked out why those things are called "lenses". They don't refract light in any significant way and are not shaped at all similarly to a lentil. Why aren't they "colour filters"? Is "lens" a techie theatrical-lighting term for them? (A near-erased memory from deep, deep offline storage tells me the theatrical term is "gobo"...)

Peter