To sign lamp, take your non-dominant hand and lay it out flat in front of your body, palm facing down. Then take your dominant hand, and resting its elbow on the fingers of your non-dominant hand, make a gesture of a bright light shining: start with your fingers all touching each other, then open them up, like the sun shining or a flashlight being switched on.
An alternative ASL sign for lamp is to simply make the sign using the dominant hand and forearm, excluding the non-dominant hand and forearm, which serves as the table top.
Teach your baby the sign for lamp when you want to either switch it on for night-time storytelling or switch it off when your baby is about to sleep.
Some babies show a great deal of interest in lamps and shiny objects. You can teach this sign by turning a light on and off.