A 2-liter plastic bottle is taken, filled to the neck with water and tightly twisted with a cap.
In the roof of a building made of light roofing material, in which lighting is necessary, a hole is made in diameter of 7.6 cm, a bottle of water is inserted upside down. The junction of the roof and the bottle is coated with sealant.
Inside the building, the bottle is temporarily fixed until the sealant dries. When the sealant dries, the temporary support is removed. Let there be light!
When the bottle is illuminated with direct sunlight, a stream of light is created inside the building, equivalent to an electric bulb up to 60 watts.
This lighting method is relevant for various utility rooms in a summer cottage and other facilities. The author used this method to place a bath at his summer cottage.
Safe, free and very easy!
