switch the lamps

there are some monsters that are interested in killing you and they are really really afraid of light , there are 4 lamps in the game , the one in the middle do nothing , its just there but the others keep the monsters away but by the time passes the lamps light will slowly het less and less until they are fully broken and out of work so you have to switch the old lamps with new ones(by goin to them and pressing q) there are 2 characters in this game which you can switch between them at any time...