In impoverished areas of the Philippines, many households cannot afford electricity and don't use their lights. As the homes are so densely packed, they block sunlight and remain in darkness even during the day. Illac Diaz is a social entrepreneur who is striving to help those in this situation by promoting the use of an ingenious method of lighting using plastic bottles. This episode of Asia Insight focuses on his project and the lives of those who struggle to find adequate sources of lighting in the Philippines.