This is an old trick by using Philippine peoples. Simply water and bleach in bottle of coke was fitted on the roof. It absorbs and reflects sunlight and is equal to 55 watt. The bottle is three fourth the way up down from the surface of the roof into the ceiling. The bleach keeps the water clear. It is a practical way to have decent, vibrant light indoors during the day.
Above thousands of bottles light have been mounted across Manilla city. For more detail watch below video, I think this is a fantastic, simple and effective solution to a real world problem in those countries where people are facing electricity problem such as load shedding.[adsense]
Plastic Bottles Become 55 Watt Natural Light Bulbs
