Your body relies on six foundations. How would you rank them?

Rank them by how much the quality of each affects you over the long term, most important first. It takes a minute, and the result surprises most people.

Alex Pratt OBE

Alex Pratt OBE | Founder

0 of 6 ranked

Here is how your answer compares.

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    How most people rank them

      The big health surveys do not even include light.

      When 30,000 people in 13 countries were asked what matters most for a long and healthy life, sleep came first, diet second, exercise third. Light was not even offered as an answer.

      90%of your life happens indoors.
      18%of people realise it is that much.

      Sources: ResMed's 2026 Global Sleep Survey, 30,000 people in 13 countries. The Indoor Generation, YouGov for Velux, a survey across 14 countries.

      ▶  Watch The Indoor Generation, Velux's three-minute film seen 110 million times.

      Why might light seem last?

      Light is so familiar that most people only notice it when it is gone. You read the same line twice, or carry your book over to the window, and blame your eyes.

      At 60 your eyes need up to three times more light to read comfortably than they did at 20. The change is so slow that most people put it down to tiredness, when much of it is simply the light.

      Brightness is only half of it. An ordinary bulb only looks white: it leaves gaps across the colours it makes, and your eyes work hard to fill them in. Daylight has no gaps, which is why reading by a window on a clear morning is easy. Daylight Wavelength Technology™ rebuilds that spectrum at 98% accuracy.

      “I have asked this question for forty years. Light still comes last almost every time. I believe this is simply because we don’t immediately feel the powerful chronic impacts of poor light in the way we notice a bad night’s sleep, but it is just as impactful.”

      Alex Pratt OBE | Founder

      Keep reading.

      Is junk light making us ill?Most homes are lit by junk light. This is the research on what it does. The peer-reviewed studiesTen published studies on light, sight and sleep are explained in plain English. The Serious storyIt began with one request from Alex's mum, and thirty-seven lamps that failed.

      Light is the one thing on this list you can put right today.

      Everything else on the list takes months to improve. The right light changes what you can see the moment you switch it on. Try an HD Original for up to 90 days at home and judge it by your own book.

      See the High Definition Original

      If it is not for you, we collect it free and refund you. Five years on the light, lifetime on the arm.

      Or call free on 0800 032 9364, Mon–Fri 8:30am–5:30pm.