But one group of people that don’t have these advantages, found their own solution – do-it-yourself full-spectrum bulbs.
1. Take an empty 1.5 litre clear plastic bottle.
2. Fill with water and a little bleach.
3. Punch a hole in the roof and make a water-tight seal for your bottle.
The sun now comes through with the light of a 55 watt lightbulb – all without electricity.
You can watch the video of this process here.