Inspired by solar lights used in third-world countries, this light costs less than $5 and uses a 2-liter soda bottle, foil, bleach and a few tools you probably already own. The light puts out around 55 watts of light by magnifying the sunlight and gives off enough light to illuminate a 10 by 10-foot (3 by 3-meter) aluminum shed during the day. No wiring or bulbs required.
To make and install your solar light you will need a 2 liter clear plastic soda bottle, a drill with a 1-inch drill bit, tin snips, bleach, a square of aluminum foil, a pencil or marker and a measuring cup.
You'll also need weatherproof caulk. We used a caulk gun and a tube of caulk, but you can buy tubes that you can squirt without a gun at your home improvement store. And if you can't reach the top of your shed, you'll need a ladder.
First, decide where you want your light. You'll need to place it near the support beam that goes across the ceiling of your shed for extra support. Hold the bottle up to the spot you want your light and trace around it with your pencil or marker.
Using the tin snips, cut out the circle you traced, but make sure that the circle you cut is around an eighth of an inch (3mm) smaller than the one you traced. This will give the light a snug fit when you slip it into the hole.
Tear off a small piece of aluminum foil and use it to cover the top of the bottle. Then screw the lid onto the bottle over the foil. The foil will help to reflect light, making the solar light brighter. You can trim the foil around the edges of the lid or leave it there.
Place the light into the hole in the roof until two-thirds of the bottle is inside of the shed with the lid of the bottle sticking outside the roof. Then caulk around the bottle and the opening to make it waterproof.
Now that your solar light is finished, it will last around 5 years or until the plastic turns cloudy from being exposed to the elements. The light also works at night, to a certain extent, as long as there's plenty of moonlight.