What is the ruling on working as a lighting technician at the Egyptian Opera House?

Your work as an electrician at the Opera House is impermissible, because it is used for acting and dancing that involves the uncovering of 'awrah (private parts) and deviation from Sharia. Your work contributes to the success of these forbidden acts, and this is considered cooperation in sin and aggression. Allah the Almighty said: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression."