All you need its an empty bottle, some water and some bleach… and hey presto! You have your very own environmentally-friendly solar bottle light bulb.
Making the most with what you've got, truly inspiring stuff.
A bottled litre of water with a few teaspoons of bleach is proving to be a successful recipe for dwellers in the light-deprived slums of the Philippines. The simple technology is spreading sunlight in places where it has never been, and saving residents money at the same time. Gemma Haines reports.
How to make a water bottle light bulb.
Step 1. Fill the 1.5 liter clear soda bottle with purified water then add 3 tablespoons of liquid bleach and tightly seal the cap. Do not use tap water because this will allow the growth of moss.
Step 2. Make a hole in the 1’x1’ roof sheet material, just the same size of the bottle’s circumference and insert the bottom part of the bottle leaving it exposed under the sunlight.
Step 3. Next, make another hole on the roof of the house where you want to put the solar bulb. The hole needs to be the same as the bottle’s circumference. Firmly fix the device into the hole.
Step 4. Seal the roof with a sealant to prevent raindrops from getting inside the house. It will produce a light when the water inside the bottle bulb refracts and scatters the light inside the house.
The solar bulb is expected to last up to two years before it needs changing.