In some Philippine slums, solar skylights made from one liter soda bottles filled with water and bleach provide light equivalent to that produced by a 55 watt bulb and may reduce electricity bills by US $10 per month.
In some Philippine slums, solar skylights are made from one liter soda bottles filled with water and bleach. They provide light equivalent to that produced by a 55 watt bulb, and may reduce electricity bills by US $10 per month.