Liters of Light: Solar Bottle Lighting for Off-Grid Shanty Homes in the Philippines

Reset A− A+ The Liters of Light project brings free daytime illumination to dark shanty homes using recycled plastic bottles filled with water and bleach. This simple solar lighting solution requires no electricity, costs almost nothing to install, and provides up to 60 watts equivalent of clear light for families who previously relied on expensive and dangerous kerosene lamps.

How It Works

• Materials: One-liter plastic bottle, water, four teaspoons of bleach
• Installation: Hole cut in corrugated iron roofing, bottle inserted and sealed
• Installation Time: Less than one hour
• Light Output: Approximately 60 watts equivalent
• Lifespan: Up to 5 years (bleach prevents algae growth)
• Cost: Nearly free using recycled materials

Before Liters of Light

After Liters of Light

Project Impact

• Scale: Thousands of installations across the Philippines
• Inspiration: Similar projects in Brazil and concepts from MIT
• Founder: Ilac Diaz, entrepreneur focused on simple green technologies
• Community Involvement: Hundreds of volunteers participate in installation events

Video Demonstration

Lessons from Liters of Light

• Simple Solutions Solve Big Problems: A plastic bottle, water, and bleach provide free lighting for five years
• Recycled Materials Have Value: Trash becomes infrastructure when creatively repurposed
• Zero Energy Consumption: Solar refraction requires no electricity or ongoing fuel costs
• Health Benefits: Eliminates indoor smoke from kerosene lamps
• Scalable Design: Anyone can install these with minimal training

Related Off-Grid Solutions

• Tiny Houses
• Cabins

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Alex

Alex Pino is the founder of Tiny House Talk, a leading resource on tiny homes and simple living since 2009. He helps readers discover unique homes, connect with builders, and explore alternative living.

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