See PDF file, 24 LED Hockey puck lights are available at any auto parts store or electronics store. I paid ~ $4.00 for the ones I got. They usually have a hook and magnet on the back side. Or you can use a mighty bright unit (goose-neck 6 LED's close-pin type) from Costco. You may already have one? We only cover the hockey puck ones, but the design is universal for 3 x AAA batteries systems.