MAKING %) WATTS BULB FROM WATER BOTTLE(zero electricity needed)
just i found a cool method of light harvesting which is very cheap and amazing.
Using just a 2 liter bottle(plastic or glass, plastic bottles are highly recommended while concerning safety), 2 lids full of bleach and a camera film dispenser you can build the cheapest solar energy harvester.
<a href="https://mytheoriesarehere.blogspot.com/2011/05/making-50-watt-bulb-from-2-liter-bottle.html" target="_blank" rel="nofollow noopener noreferrer">Green it......: MAKING 50 WATT BULB FROM 2 LITER BOTTLE - ADVANCED CHEAPEST SOLAR ENERGY HARVESTER</a>
here in this blog i given directions to make the bulb.If any one have doubt just let me know.