Louis Garneau Spider Lock Vision Bicycle Helmet Mounted Taillight. If you'll be commuting or training at night, you need to be sure you're still visible. It's easy to forget to bring a blinky light, but if you have a Louis Garneau Bicycle Helmet with SpiderLock or SpiderLock II harness, you're in luck. The Louis Garneau SpiderLock Vision is a small red blinky light that attaches to the adjustment wheel on the back of your Bicycle Helmet. It's a fully functional safety light that still lets you adjust your Bicycle Helmet. And since you always wear your Bicycle Helmet, you'll always have your light. It couldn't be easier.