Stay safe & seen all day, all year & all around thanks to the 360 degree visibility provided by the Vortex & Nebula. Vortex The Variable Lumen System lets you pick the exact lumen output that you need-simply hold down the VLS button. The Vortex also now features easy button control to make your cycling life even easier. The memory mode ensures your light comes back on in the same mode it went off, so you can just jump & go without the faff of cycling through modes. The lock mode ensures you dont waste battery by accidentally turning on, & dayflash makes you easily seen in the daytime. Nebula With an enhanced ouput of 200 lumens in dayflash mode, the Moon Nebula is a great value for your money light for any discerning cyclist. Stay safe & seen. The light memory mode ensures that the Nebula stays in the same mode when you turn it off & on to save you the faff of cycling through the modes. The Nebula also features indicators for low battery, charging & fully charged. Auto safe mode also stops you from getting stranded, with a reduced output of an hour to get your home when battery is running low.