A tilting bike light that's led by your head
If you're looking for a bicycle handlebar stem with a built-in headlight and computer … well, until now, that would have just been the SpeedForce. Hong Kong-based inventor Kim Luk has taken that concept and added to it, however. His water-resistant Speednite stem not only has a computer and an 800-lumen headlight, but the light tilts up and down as your head does, plus turning your head to either side triggers laser-projected turn indicators.
The basic idea behind the Speednite is that if you're looking at the bit of road that's right in front of you, your head will be angled down, so your light should be too. If you want to see what's farther up the road, your head will be tilted up. Likewise, if you're about to hang a left or right, your head will first turn in that direction.
The headlight-tilting and turn-indicating action is made possible by a motion sensor which is attached to the top of the helmet, that wirelessly communicates with the stem. There's also a wireless handlebar-mounted controller than can be used to manually control those functions – so no, you're not stuck with having the turn indicators come on every time you turn your head.
For its part, the computer is able to display data such as speed, cadence and heart rate from paired third-party devices. If paired with an iOS/Android app on your smartphone, it can also display things like GPS coordinates. Additionally, if the motion detector detects what might be an accident, the app will send a message to your emergency contacts (unless you stop it from doing so within 10 seconds).
The Speednite's removable and rechargeable lithium-ion battery has a reported run time of about two hours at full headlight output, or anywhere from 4 to 40 if set to a lower-output or flashing mode. Weight of the whole device is 330 grams.
Luk has turned to Kickstarter to finance production of the stem. A pledge of HK$1,200 (about US$150) will get you one in your choice of 90- or 100-mm lengths, when and if they reach the market. The planned retail price is US$299.
It's demonstrated in the following video.