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Welcome. how to do so in the room was dark?.
and when the light up to make it clear

Not really sure what your asking for here. If you want a room completely dark you need to lower the ambience to zero.

Open your map editor click on files>build>click on the second tab(forget what its called) then the second tab down. Scroll till you find ambience. Set all to zero, be sure to hit enter after each value change or it won't change in the game.

Now when you want to light up the room you can place a light.
Dynamic if your going to use a switch or triggerzone to turn the light on or static if you just want the light to be on.

However that will make your whole game dark. If you just want the room dark. Place a dynamic light in the room, Set the main to lightoff.fpi and name it something unique like "MyLight". You will have to put a switch somewher, of some kind to turn the light on when desired. add the name of the light in the switches ifused field.

If it's a triggerzone that will turn on the light use the Activateifused.fpi in the triggers main. and add the light name to the ifused field.

Hope this helps.