Five people standing on a stage, getting ready to perform, who are unrecognizable due to the lack of lighting.
In a dim room, several actors who can barely see each other, are getting ready to act.
In a dim light on stage Five people are standing are getting ready to perform the radium light performance.
The room is dim due to lack of lighting causing the people who are are actors to barely see each other.
Five people on a stage implies actors. Dim and lack of lighting are the same. Both groups of people performing/acting.