Liz in the Adafruit forums writes:
You can’t really see without a video, but the display alternates between showing the current UV index and the total exposure since turning the hat on. When the exposure display fills all the pixels, I’ve reached the ‘barely perceptible 24 hours later sunburn’ level and it’s time to go inside. I plan to keep the hat on my desk at work for lunchtime excursions. I don’t normally wear sunscreen to work, so having the hat to keep track of my exposure is really practical.
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