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Liter of Light

Liter of Light is a global open-source initiative founded in 2011 in the by the MyShelter Foundation to address in off-grid communities through sustainable, low-cost lighting solutions made from recycled plastic bottles and solar technology. The core technology involves filling a one-liter bottle with and a small amount of , then sealing and installing it through a to refract into interior spaces, providing illumination equivalent to a 60-watt incandescent without electricity or emissions. For nighttime use, the system can be upgraded with affordable LED bulbs, micro-solar panels, and batteries, creating versatile devices such as home lights, mobile chargers, and streetlights using locally sourced materials. Originating as part of low-carbon building efforts in Laguna province, the project gained momentum after Typhoon Haiyan in 2013, leading to its formal establishment as a global movement that year and rapid expansion through grassroots volunteer networks and social media replication. By 2017, it had installed over 350,000 bottle lights benefiting 353,000 households across more than 15 countries and reducing carbon emissions by replacing kerosene lamps and bulbs. As of 2024, Liter of Light operates in over 30 countries, illuminating the lives of more than one million people annually and empowering 15,000 families (affecting 75,000 individuals) through programs like "Light It Forward," which distributes lights while training locals in assembly and maintenance. The initiative emphasizes community empowerment by teaching green skills to thousands of volunteers and engaging over 650 women's cooperatives in and distribution, fostering local jobs and self-reliance in climate-vulnerable areas. It serves as a global ambassador for 's International Day of Light, aligning with education for on , , and energy access, while creating large-scale solar art installations since 2018 to raise awareness. Recognized by the World Habitat Awards and the UN's Momentum for Change initiative, Liter of Light promotes open-source designs that reduce fire risks from traditional lighting and cut lifetime carbon emissions by up to 1,000 kg per device over five years. In 2025, it achieved a for the largest display of solar-powered lamps.

History

Founding and Early Development

Liter of Light was founded in 2011 by Illac Diaz through his MyShelter Foundation, established in 2006, as a direct response to affecting off-grid slums in the . The project sought to deliver sustainable, low-cost lighting to underserved communities lacking reliable , drawing from Diaz's prior experiences with disaster recovery efforts following typhoons like Ondoy in 2009. The first prototype—a device using a recycled filled with water and —was tested that same year in the Tondo slums of , illuminating dark interiors without . The concept was inspired by Brazilian mechanic Alfredo Moser's 2002 innovation of filling plastic bottles with water to refract sunlight into homes, which MyShelter adapted into a scalable, roof-installed light-refracting device suitable for corrugated metal roofs common in Philippine shanties. This adaptation emphasized local materials and simplicity, transforming waste plastic bottles into functional lighting while addressing both energy access and environmental waste issues. Initial rollout in 2011 targeted disaster-affected areas recovering from Typhoon Ondoy, with the project installing its first 10,000 units in slums to provide immediate relief. Funding came through partnerships and foundation resources, enabling rapid deployment to vulnerable households. By focusing on post-disaster zones, the initiative demonstrated its potential for quick, impactful intervention in energy-scarce environments. Early implementation faced hurdles such as securing consistent supplies of clear plastic bottles amid variable and overcoming resident skepticism about the device's in harsh weather. These were addressed via hands-on sessions for local volunteers, who learned to assemble and install the units, fostering and ensuring sustainable adoption. This model laid the groundwork for broader empowerment, later evolving the project to include solar-powered nighttime lighting innovations.

Global Expansion and Key Milestones

In 2012, Liter of Light rapidly expanded within the , installing thousands of solar bottle bulbs in low-income homes across multiple cities to address following the project's initial launch. The project's global expansion began in 2013, with early implementations in countries including and , introducing the open-source design to communities facing similar lighting challenges. By 2014, the initiative scaled significantly through its open-source model, which enabled global replication using readily available materials, reaching over 200,000 installations worldwide and setting the stage for a goal of one million lights by the following year. This expansion was bolstered by the project's emphasis on community-led training, allowing local groups to produce and distribute the devices independently. In 2015, Liter of Light received international recognition from the United Nations Framework Convention on Climate Change (UNFCCC) through its Momentum for Change initiative, highlighting the project's role in access, alongside winning the Zayed Future Energy Prize for its innovative solutions. A key milestone came in 2024 when Liter of Light achieved a for the largest display of solar-powered light bulbs, featuring 3,000 units assembled by students in with the Al-Futtaim Education Foundation, demonstrating the scalability of community-built solar technology. Following the onset of the in 2020, the organization adapted by leveraging its open-source framework to maintain momentum, including remote skill-sharing to support ongoing installations in vulnerable areas despite in-person restrictions. In 2023, Liter of Light deepened its ties with as a global ambassador for the International Day of , partnering on education programs that train youth in green skills and sustainable energy practices across 32 countries. Marking a recent highlight in youth-led after COP28, Liter of Light set another on July 1, 2025, for the largest display of solar-powered lamps, comprising 2,743 hand-built units installed in in partnership with Sun Life and the , with a total of 3,500 lamps subsequently donated to underserved communities.

Technology

Daylighting Devices

The Moses Bottle, the flagship daylighting device of Liter of Light, utilizes a recycled one-liter plastic bottle as its core component. The bottle is filled with and approximately 10 ml (two capfuls) of to inhibit algal growth and maintain clarity. This simple assembly is designed to be inserted into a roof opening, where it captures and redirects sunlight into enclosed spaces without requiring electricity. The underlying physics relies on and within the water-filled bottle. enters the exposed top portion above the roofline and interacts with the water-air , causing the light rays to reflect internally and diffuse evenly in all directions. This process produces an omnidirectional illumination equivalent to a 40-60 watt incandescent , effectively brightening interiors during daylight hours and outperforming simple roof openings or covers in light distribution. Installation entails cutting a precise hole in the to accommodate and securing it with a custom iron adapter, typically a galvanized sheet with concentric circular cuts for a tight fit. The assembly is then sealed using or rubber around the edges and rivets to ensure and structural integrity. With proper setup, the device requires minimal and boasts a lifespan exceeding five years, as the sealed water solution remains stable over time. At a production cost of under $2 per unit, the Moses Bottle leverages locally sourced waste materials, making it highly accessible for low-income communities. By repurposing discarded PET bottles, the initiative diverts significant plastic waste from landfills, with global deployments having reused hundreds of thousands of bottles to date and promoting broader environmental sustainability through reduced material consumption.

Solar-Powered Innovations

In 2013, the Liter of Light project evolved its original device into a -powered by integrating low-cost LED circuits, rechargeable batteries, and small solar panels directly into the bottle base, enabling 6-8 hours of nighttime illumination after a few hours of charging. This development, led by the MyShelter Foundation in collaboration with the Electronics Engineering Department, aimed to address the limitations of passive lighting by providing an active, electricity-free solution for off-grid communities. The core components of these early solar kits include a 1-watt for charging, a 3.7-volt (typically 2200 mAh capacity) for , high-efficiency white LEDs (1 watt, producing 90-100 lumens), and a basic circuit with an automatic switch using and BJT transistors to activate the light at , without a separate due to the system's simplicity. These elements are housed in a durable pipe or attached to the upcycled bottle, with the total production cost ranging from $5 to $10 per unit, making it accessible for widespread deployment. Assembly is designed for community participation, requiring only basic tools like screwdrivers, wire strippers, and soldering irons, along with open-source blueprints that allow local groups to manufacture and customize the kits using readily available materials. Volunteers the surface-mount components onto a , wire the and , and seal the unit into a protective enclosure, often during short training workshops that empower participants with green skills. This hands-on process has been refined over time to support scalable production in over 30 countries. Subsequent advancements have focused on modularity and versatility for challenging environments, including disaster relief efforts where kits are adapted into portable reading lanterns, lights, or mobile charging systems with USB ports to power devices like phones during crises, such as post-typhoon recovery operations. By 2022, these modular designs were integrated into broader campaigns like "Light It Forward," enabling communities to assemble and distribute customizable battery kits that combine micro panels with solarettes for multifunctional use. In pilot projects as of 2024, enhancements include improved durability for extreme conditions and expanded open-source resources to facilitate local innovation in applications.

Operations

Geographical Reach

Liter of Light has established a presence in over 30 countries since its inception in 2011, focusing on off-grid and energy-poor communities in the Global South. As of 2024, the initiative has installed lights in more than 1 million households worldwide, illuminating the lives of approximately 1.5 million people. In 2025, partnerships like one with distributed over 1,900 solar lamps in rural and during . The majority of operations target , , and , with representative examples including substantial deployments in the (over 150,000 households as of early expansion phases), , , , and in Asia; and in Africa; and , , , the , and in Latin America. Adaptations to local environments are integral, with the open-source design using readily available materials tailored to needs, such as in arid or flood-prone regions. Involvement in and remains limited, primarily in countries like , the , , the , and the , where efforts emphasize training programs and funding support rather than direct installations. Key partnerships include collaborations with the (UNDP), , and local NGOs, alongside over 650 women's cooperatives that drive community-level implementation.

Community Training and Implementation

Liter of Light employs a hands-on model that emphasizes short, practical workshops to equip local participants with green skills for assembling lighting devices. These sessions, often conducted in community settings, focus on and women's cooperatives, where groups of about five participants learn to build simple LED lights using recycled materials and basic tools, inspired by approaches like the Grameen model. By 2023, the initiative had involved over 2,800 young volunteers globally in such , fostering self-reliance and job creation in . Implementation begins with community consultations to assess site suitability, particularly roof conditions for safe installation of the devices, ensuring they fit thin or structures common in off-grid areas. Community-led installations follow, where trained locals, supported by entrepreneurs or volunteers, deploy the lights in batches, such as seeding 100 to 500 homes per project through efforts. Follow-up maintenance is handled by designated "light ambassadors" from the community, who monitor installations, perform repairs, and address issues to ensure long-term functionality of the simple, durable designs. Programs prioritize inclusivity by targeting marginalized groups, including women in correctional facilities, persons with disabilities, indigenous communities, and disaster-affected populations. For instance, post-Typhoon Haiyan efforts in Tacloban's "Corridors of Light" engaged local survivors in building and installing lights to restore essential illumination. The initiative's scalability relies on an open-source framework, with kits and instructions shared via online resources and shipped to partners in over 30 countries, enabling local production without heavy reliance on imports. Post-2020, virtual training through campaigns like "Light It Forward" has expanded reach, engaging over 3,000 participants in the alone in remote sessions that build capacity for assembly and deployment.

Impact

Social and Environmental Effects

The deployment of Liter of Light's solar solutions has significantly reduced indoor in off-grid communities by displacing the use of lamps, which are a major source of harmful fumes leading to respiratory illnesses. In areas where traditional contributes to risks, the initiative's lights prevent to toxic emissions, aligning with broader studies on alternatives that highlight decreased incidence of respiratory cases. Additionally, by providing reliable illumination, these installations enhance household safety, reducing fire hazards associated with open-flame lamps and lowering accident rates in low-light environments. On the educational front, the additional hours of enable children in energy-poor homes to extend time beyond daylight, fostering improved learning outcomes and academic performance. Health metrics from implementations show a notable decrease in among users, while overall accident rates in lit spaces have dropped, supporting WHO guidelines on safe lighting for vulnerable populations. Gender equity is advanced through the program's emphasis on women-led training and installations, with women's cooperatives comprising a substantial portion of micro-entrepreneurs and engineers involved in projects across multiple countries. Environmentally, Liter of Light contributes to substantial CO2 emission reductions by replacing fossil fuel-based lighting; each solar light offsets approximately 1,000 kg of CO2 over its five-year lifespan. The use of recycled plastic bottles for these devices also mitigates waste, diverting materials that would otherwise pollute landfills and waterways. As of 2024, deployments have reached over 1 million households globally. Community training plays a key role in sustaining these benefits by empowering locals to maintain installations. In 2025, initiatives like a for the largest display of solar-powered lamps in further raised awareness and expanded reach. Despite these gains, challenges persist, particularly in regions with heavy rainfall, where occasional leaks can occur if adhesives fail to provide a durable seal; this issue is addressed through ongoing experimentation with improved, leak-proof glues by local implementers.

Economic and Educational Benefits

The Liter of Light project delivers substantial economic benefits to low-income households by significantly reducing lighting expenses. By replacing costly lamps or grid electricity with -powered bottle lights, each installation enables monthly savings of approximately $8-10 per household (as of 2015 data), freeing up funds for other essential needs such as food and . These cost reductions are particularly impactful in off-grid areas, where imported solar alternatives can be up to three times more expensive, allowing communities to achieve energy access without incurring debt. The initiative also stimulates local economies through the creation of micro-jobs in , , and . Training programs empower groups, often comprising five women per unit, to produce lights using locally sourced materials, thereby generating and cutting logistics costs by 70%. These efforts have mobilized hundreds of individuals in the for hands-on production and distribution roles, contributing to broader job creation across the project's in more than 30 countries. On the educational front, Liter of Light partners with schools to embed its technology into curricula, fostering practical learning in , , and . These workshops train thousands of students annually, equipping them with skills to build and maintain devices while linking concepts like light to real-world applications. A notable example includes 2024 programs in , where collaborations with local organizations integrated light assembly into lessons on clean energy, enhancing student engagement and innovation. Entrepreneurship is further advanced through community-led cooperatives that produce and sell lights, with women's groups retaining 20% of as sustainable . This model has generated collective earnings across projects while boosting employment in trained regions by providing pathways into green manufacturing. In the long term, the transferable skills—such as assembly and maintenance—enable participants to innovate in other green technologies, reducing unemployment in urban slums by establishing local hubs for eco-friendly enterprises.

Recognition

Awards

Liter of Light received the World Habitat Award in 2014 from the World Habitat Awards scheme, co-managed by the (UN-Habitat) and the International Union of Local Authorities (UCLG), for its innovative sustainable housing solutions that utilize recycled plastic bottles to provide affordable in off-grid communities. The award highlighted the project's rapid scale, recognizing installations benefiting over 350,000 homes across 15 countries within its first 20 months, demonstrating a low-cost, open-source approach to addressing in informal settlements. In 2015, the initiative was honored with the Zayed Future Energy Prize in the non-profit category for its pioneering solutions, including solar-upgraded bottle lights that reduce reliance on and promote community self-sufficiency. This prestigious award, worth $1.5 million, provided significant funding to expand operations globally, enabling the distribution of sustainable lighting kits to additional underserved regions. The organization earned the St Andrews Prize for the Environment in 2016, awarded to its Brazilian chapter for in delivering eco-friendly lighting to energy-poor areas, with the US$100,000 prize supporting further training and deployment in . This recognition underscored Liter of Light's model of empowering local communities through hands-on solar technology assembly, fostering green jobs and environmental conservation. In 2023, Liter of Light was selected as one of the Green Citizens projects at the ChangeNOW Summit, acknowledging its community-led initiatives that integrate with to combat energy access barriers. The designation emphasized the program's role in building resilience among vulnerable populations by teaching sustainable skills that enhance learning environments without .

Notable Achievements

Liter of Light has earned recognition through several Guinness World Records for innovative solar lighting displays. In June 2025, the organization, in collaboration with Sun Life of (Philippines), Inc. and the , achieved the record for the largest display of -powered lamps, consisting of 2,743 hand-built units arranged in to highlight and . Earlier, in 2024, Liter of Light set a for the world's largest artwork, featuring 3,000 student-built lamps forming a Ghaf tree installation in the UAE to promote environmental awareness. The project's founder, Illac Diaz, has amplified its message through influential media appearances, including his 2012 TEDxRio+20 talk "Genius of the Water Lamp," which detailed the invention's potential to combat using recycled materials. By 2025, Liter of Light had reached more than 1.5 million people across over 30 countries, impacting communities by providing affordable illumination and fostering green skills training. At the 2023 COP28 UN Climate Change Conference, Liter of Light partnered with students from the community in the UAE to create a large-scale net-zero artwork , showcasing solar-powered lights to emphasize youth-led during the event's opening. The initiative's open-source design has enabled widespread adoption, with blueprints freely available for local replication and inspiring grassroots adaptations in various regions worldwide.

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