Remove the kerosene heater's lid. If there is a wick assembly inside, remove it. This may require a screwdriver.
Clean the heater with a damp microfiber cloth, inside and out.
Measure the diameter of the cylindrical heater cabinet. Subtract 2 inches. Use this measurement to cut three pieces of 2-by-4 lumber with a hand saw.
Place one piece of wood inside the heater. Set a pre-wired mason jar lamp lid with a light bulb on top of it. If the bulb sits lower than you want it to, stack a second piece of wood on top. Add the third piece of wood, if necessary. Remove the wood from the heater.
Place the wood pieces in a stack so that they intersect to make an X, with the first and third piece parallel to each other, if applicable. Hot glue the wood together at the spots where they intersect.
Hot glue the bottom edge of the mason jar lamp lid to the top piece of wood. Tape the cord to the inside of the cabinet near the top with electrical tape, allowing the end to drape over the back.
Plug in the lamp. Place the lid on top of the heater to allow the light to illuminate the vents from inside.