In this episode, our guest is Christina Friis Blach, co-founder of Lys Technologies, about how light shapes our health, performance, and daily lives.

They explore how sunlight exposure and circadian rhythms influence sleep, hormones, and energy—and why modern indoor environments often disrupt this balance.

Christina shares how her company is helping bridge the gap between science and real life through wearable light technology and sunlight analysis tools.

☀️ About Lys Technologies

Lys Technologies develops wearable sensors that measure the light you’re actually exposed to throughout the day—close to the eye, where it matters biologically.

Unlike traditional light meters used in architecture, their technology focuses on human-centric lighting, tracking how light impacts:

• Circadian rhythms and sleep
• Hormone regulation (melatonin, cortisol)
• Daily energy and performance

Their tools are used globally across research, healthcare, workplace design, and even elite sports—helping drive better sunlight analysis, building design, and behavior change.

☀️ Key Takeaways

• Light is a biological signal, not just for vision
• Modern lighting can disrupt circadian rhythms
• Wearable sensors enable real-world solar exposure tracking
• Natural light is critical in real estate and building design
• Shadow mapping and sunlight analysis are shaping healthier spaces

Sunlight Matters is a podcast exploring the role of the Sun in human health, architecture, cities, and everyday life.

Through conversations with scientists, architects, and technologists, the series examines how natural light shapes our bodies, our buildings, and the way we live indoors.

Hosted by Dave Wallace, Sunlight Matters asks a simple but overlooked question: what happens when we disconnect from the Sun?

Because sunlight isn’t optional. It matters.

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