Lumen raise US$62 million
More: Lumen Review
In its second round of funding, Lumen raises a tidy US$62m from a variety of venture capitalists including Almeda and Resolute. It was founded in 2014 and had previously raised $14m.
Lumen is a unique consumer product that measures metabolism through carbon dioxide in breath. The variation in CO2 exhaled and inhaled across a series of readings is used to estimate fat and carb burn. Lumen’s app platform gives daily personalized nutrition and lifestyle guidance based on their results. In recent(ish) months Lumen introduced support for viewing the results and insights on both the Apple Watch and Garmin platforms.
Lumen states that more than 2 million measurements are made each month
I would estimate an average of 30 readings per user per month which would indicate over 60,000 active users.
Lumen now has a subscription-only contract which should deliver a minimum of $250pa per user. Hence the company’s annual turnover might be $18m…or not.
The new funding was not stated to be destined for new products and is planned to be used to:
- Expand geographic sales coverage
- Further develop the nutrition/lifestyle side of the app
- Continue academic research funding
Last Updated on 24 January 2026 by the5krunner
My favourite kit and nutrition
- Maurten — the race nutrition trusted by elite athletes. Gels and drink mix engineered to be easy on the stomach.
- Garmin 90-degree charging adapter — the small adapter that keeps your charging cable tidy at the stem. Essential for race day.
- Garmin charging puck — the fastest and most reliable way to top up your Garmin before a session.
- Ravemen FR300 — front light that mounts directly under your Garmin or Wahoo head unit. Keeps your bars clean and your beam pointed where it matters.
- Garmin Varia RTL515 — radar rear light that alerts you to vehicles approaching from behind. Pairs with your Edge or Garmin watch.
- Stryd — the footpod that brings running power to your Garmin. The single most useful running upgrade I have made.
- Favero Assioma Pro RS2 — the power meter pedals most serious cyclists end up choosing. Accurate, easy to move between bikes.
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID
