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Lasse Leponiemi

Chairman, The HundrED Foundation
first.last@hundred.org

Two Sides of Light

place India + 1 more

Protecting our night skies and slashing toxic chemical waste through smart lighting.

Two Sides of Light tackles two distinct environmental crises: ecological disruption from light pollution and toxic waste from legacy bulbs. By advocating for dark-sky friendly shielding and a 100% transition to efficient, mercury-free LEDs, we aim to protect nocturnal ecosystems, eliminate hazardous chemical e-waste, and dramatically slash global carbon emissions.

Overview

Information on this page is provided by the innovator and has not been evaluated by HundrED.

Updated June 2026

2026

Established

1

Countries
Community
Target group
Through 'Two Sides of Light', I hope to see education shift from passive textbook learning to active, real-world community problem-solving. Environmental science often focuses on overwhelming, global-scale crises that can leave students feeling helpless. I want to change this by transforming a student’s immediate school campus and neighborhood into a living laboratory. Instead of just memorizing the physics properties of light or the chemistry of heavy metals for an exam, students apply this knowledge practically—conducting audits to map light pollution and calculating real energy waste. Secondly, I want to see education become more interdisciplinary, bridging the gap between STEM and digital media literacy. By teaching students how to translate dense scientific data into high-impact visual infographics and video pitches, learning becomes holistic. It equips young people with both scientific literacy and the communication tools needed to advocate for change in a modern, digital society. Ultimately, the greatest change I hope to see is the cultivation of genuine student agency. When young people learn how to build a data-backed case and successfully pitch school administrators for physical lighting retrofits, they realize their voices have power. I want education to empower students to see themselves not just as passive consumers of information, but as active leaders capable of driving measurable, positive environmental change from the ground up.

About the innovation

Why did you create this innovation?

Artificial light has fundamentally transformed our world, but it has come at a severe ecological and chemical cost that is largely ignored. I created 'Two Sides of Light' after realizing that modern environmental conversations frequently confuse lighting geometry with lighting chemistry, leaving communities with half-measures that don't solve the core issues.

On one hand, misdirected, unshielded lighting causes massive light pollution, altering wildlife behaviors, disrupting human circadian rhythms, and breaking our connection to the night sky. On the other hand, legacy lighting like fluorescent tubes and mercury vapor bulbs represent a quiet climate and electronic waste disaster—wasting up to 80% of their energy as heat and introducing tons of toxic mercury into local ecosystems when discarded.

Most environmental campaigns only address energy efficiency while ignoring light pollution, or vice versa. I created this innovation to provide a comprehensive framework that explicitly separates these two crises while tackling them simultaneously. By offering a distinct, dual-lens approach, we empower local schools, neighborhoods, and youth leaders to look at lighting not just as a basic utility, but as a critical lever for ecological conservation and massive global carbon reduction.

What does your innovation look like in practice?

In practice, 'Two Sides of Light' operates as a youth-led advocacy and education toolkit divided into two distinct operational streams:

The Geometry Stream (Combating Light Pollution): We deploy high-impact, data-driven digital media campaigns—using kinetic typography and dynamic infographics—to educate communities on dark-sky friendly lighting habits. We teach individuals to audit their local fixtures using two clear design parameters: shielding (ensuring fixtures point 100% downward) and color temperature (advocating for warm, amber light under 2700K to prevent high-energy blue light scattering).

The Chemistry Stream (The LED Transition): We provide step-by-step frameworks for schools and community centers to transition away from legacy fluorescent and mercury vapor lighting. This involves calculating local energy savings, tracking carbon footprint reductions, and setting up safe recycling pathways for mercury-laden hazardous e-waste.

By translating complex environmental data into actionable checklists, the innovation turns students into local lighting auditors. Armed with our toolkit, young changemakers inspect their own school campuses or neighborhoods, present professional energy-saving pitches to administrators, and advocate for physical dark-sky retrofits or smart motion-sensing controls.

How has it been spreading?

As a newly established initiative launched in 2026, 'Two Sides of Light' has not yet scaled on a mass or global level. Instead, it is currently operating at an early, grassroots stage, spreading locally within a limited community of passionate students, peers, and neighborhood groups.

Right now, our strategy is focused on refining the model through direct, localized action rather than rapid expansion. We are testing the framework within our immediate community by conducting initial lighting audits, raising awareness among local students about the distinct crises of light pollution and bulb toxicity, and encouraging small-scale behavioral changes. This deliberate, localized focus allows us to work closely with a small group, observe how people interact with our toolkits, and understand the practical challenges of advocating for shielded fixtures and LED retrofits on a small scale.

While our footprint is currently limited, this local implementation serves as our essential proof-of-concept. By keeping the scope contained for now, we are gathering the necessary feedback to perfect our educational resources and media guides. This community-level success is building the foundation for a highly scalable blueprint. Once our methods are fully proven locally, we intend to utilize open-source digital distribution and global youth networks to scale the innovation from a limited community project into a widespread movement.

If I want to try it, what should I do?

If you want to bring 'Two Sides of Light' to your community or school, follow these three immediate steps:

Download the Audit Checklist: Access our open-source toolkit. Walk around your school campus or neighborhood at night and document the lighting fixtures. Identify which lights are unshielded (shining sideways or upward) and whether they use cool-white or warm-amber tones.

Run a Chemistry Check: Identify the type of bulbs used in your common areas. If you find legacy linear fluorescents or older mercury lamps, use our carbon-calculator template to estimate exactly how much greenhouse gas emissions and utility costs your school can save by switching to 100% mercury-free LEDs.

Pitch the Shift: Use our pre-built presentation slides and visual infographics to pitch a 'Smart Lighting Retrofit' to your school board or local council. Advocate for fully shielded fixtures, warm-colored bulbs, and automated timers.

Implementation steps

Assemble a Volunteer Team
Form a small group of interested students, friends, or classmates who want to work on a local environmental project. Grab a smartphone or a notebook to record your findings.
Conduct a Nighttime Visual Audit
Walk around your school campus or neighborhood block after sunset. Look up at the outdoor light fixtures and note two things down in your notebook: Are they unshielded (blasting light sideways and into the sky) or shielded (pointing light straight down)? Is the light color cool-white/blue (bad for skyglow) or warm-amber (dark-sky friendly)?
Conduct a Daytime Bulb Check
During the day, check the indoor common areas, classrooms, and offices. Note down whether the building still relies on legacy lighting like long fluorescent tubes or older mercury lamps, which contain toxic chemicals and waste energy.
Estimate the Environmental Impact
Use free, standard online energy and carbon calculators to plug in the rough number of legacy bulbs you found. Estimate how much electricity, money, and carbon emissions your school or locality could save by making a 100% transition to efficient, mercury-free LEDs.
Share Findings and Propose the Shift
Create simple posters or a short awareness video explaining your data and the distinct separation between lighting direction (geometry) and bulb types (chemistry). Present your notebook findings to your school principal, building authorities, or local community leaders to advocate for a shift to shielded, warm LED lighting.

Spread of the innovation

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