Daytime flash mode pulls 36 hours from a single charge on the Fusion Drive Pro 600+ from Lezyne, which addresses the main limitation of running lights during daylight commutes. The 1900 mAh battery capacity supports extended runtime across all six output modes, from the 600-lumen blast mode down to the 20-lumen femto mode. The day flash pattern uses the full 600-lumen output but pulses rather than running continuously, which drops power consumption enough to hit that 36-hour runtime figure.

The CNC-machined aluminum body includes integrated cooling fins that dissipate heat when you run the light at higher outputs. The optical lens design spreads light across a wider beam pattern rather than concentrating everything into a narrow spot, which works for urban riding where you need drivers to see you from multiple angles rather than needing to light up distant road surface. The power indicator displays remaining battery runtime so you know when to charge rather than guessing based on how bright the light looks.

The light ships with a rubber strap mount that secures to handlebars without tools. You can also run the light on an optional GoPro-style mount if you prefer that interface or need to stack it with other accessories. The USB-C charging port sits waterproof behind a cover and connects to standard USB-C cables, though Lezyne doesn't include a cable in the package. IPX7 waterproofing means the light handles rain and wheel spray without issue.... Read More