When installing battery operated wall sconces, you must seal the light from moisture penetration. If moisture penetrates into the wall lamp, the light will shorten out and become a fire hazard or the connections within the outdoor wall light and the light will not work. You do not have to seal around the entire light, only those areas that water can invade. The standard drive pattern seals three sides of the wall lamp, but the seal must completely seal around these three sides.
Wipe the area around the outdoor wall light with a clean cloth to remove dust, dirt and debris from the wall and bracket. Place the tube tightly to the drop-in seal gun with the nozzle turned away from the trigger and cut the nozzle at a 45 degree angle with a 1/8-inch inch opening. Squeeze the handle of the gun to start the flow of seal from the tube and release the pressure from the seal gun by pressing the lever or turning the rod of dense gun and pulling it off the tight tube. Wipe excess caulk from the tip of the caulk tube with a clean cloth.
Place the tip on the dense pipe against the wall with the tip pointing to the location where the mounting frame outdoor wall lamp meets the house siding. Run a rigid sealant down both sides of the outdoor wall lamp and another over the top. Release the pressure from the joint seal gun as described in step 3. Wet your finger in the water bowl and drive your finger along the dense bead to give it a finished look. Inspect the bead of caulk to ensure that there are no cavities in the caulk bead.