While on the Regal, I had my magnifying mirror stuck to the mirror in the room with the little half moon shaped shelf, turned on the room lights and the light right above the shelf and it gave me good enough light to put on my make-up.
But since we're on the Coral Princess in a Mini with the older configuration with the desk in the middle I will purchase a lighted magnifying mirror since I don't know how good the lighting is over the desk.