With care, Your LÜMI should last forever (well ok, at least decades). We chose high grade silicone and strong metal and magnetic clasps for a reason. We mean it when we say this is the last glow stick you should ever buy!

LÜMI’s are made from biologically non-reactive materials - they are non-toxic and biologically & chemically inert (ie. will not react in strange ways with your body or the environment). That does not mean you can eat them! Yes, we have been asked.

LÜMI’s are made from silicone, which is a flexible material made from silicon, oxygen, carbon, and hydrogens! We love silicone because it has absolutely wonderful properties (flexible, incredibly durable, can withstand a huge range of temperatures, water-resistant, low porosity, recyclable) and does not have the ‘leaching toxic chemicals’ issue that plastic has. However, in some definitions, silicone is considered plastic, to learn more click here.

Any light source will work! A broad spectrum of light including UV light works the absolute best - so go outside on a sunny day if possible! If not, a bright lightbulb is the next best thing. Your cellphone flashlight will even work in a pinch! Place the LÜMI in the light and for a super long glow, make sure to charge for at least 10 minutes.

Silicone and a proprietary blend of industrial strength photoluminescent microcrystals (aka the things that make the LÜMI glow in the dark). That's it!

Yes! Water will not impact the performance of your LÜMI. However, we do not recommend wearing it regularly in salt water, as the magnet and clasp may be affected. If exposed to salt water, be sure to thoroughly rinse it thoroughly afterward to maintain the longevity of your forever LÜMI.

The LÜMIs work as expected from environmental temperatures ranging from -20°C to 40°C. We expect they will work just as well at higher and lower temperatures - this is just what the highest temperature it’s been locally, and about the lowest temperature in our freezer haha!

The LÜMI is based on the really neat science of solid-state photoluminescence, or simply, materials that glow-in-the-dark. These materials are able to absorb the energy of light and slowly release it over time. The photoluminescent microcrystals we use are incredibly good at what they do - these are not the glow in the dark stars you used as a kid! More on our "science of LUMI' here

We currently offer LÜMIs in green and aqua, because those colours simply glow the brightest and longest. We wanted to make sure that as we are getting started everyone is getting a pretty similar and awesome experience with the LÜMIs. That said, there are other colours available! If we get enough requests to warrant trialing a different colour we may do a trial batch!

Either it has not been charged, or there is too much competing light for you to see the glow. We recommend placing the LÜMI near a bright light or in the sun to fully charge it (instructions here), then turning the lights off or placing in a well-shaded area to see the glow, and if you’re still having no luck, make sure to give your eyes a few minutes to adjust. If your LÜMI is truly not glowing at all please take a look at our refund policy and get in touch!

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