Exposure Zenith Mk4 Review 2026: Exposure’s Helmet Light, Tested
What to Look For
A handlebar light does most of the work when you’re riding in the dark, but it has one fundamental limit: it only points where your bars point. The Exposure Zenith Mk4 solves that by mounting on your helmet instead, so the beam follows your head — into corners, up driveways, and straight at whatever hazard you’ve just glanced towards. It ships with both a helmet mount and a handlebar mount, so it can double as a standalone front light too. Like the rest of Exposure’s 2026 range, the Zenith Mk4 gets USB-C charging for the first time, a new colour OLED display, and Exposure’s “Reflex 2.0” auto-adjust technology.
Key Features
- Helmet-mounted design — the beam moves with your head, giving you light exactly where you’re looking rather than just where your bars are pointed
- Ships with two mounts — both a helmet mount and a handlebar mount are included, so it works as a dedicated helmet light or a standalone front light
- USB-C rechargeable — part of Exposure’s range-wide 2026 switch away from proprietary charging
- Colour OLED display — new for 2026, for a clearer read of mode and battery at a glance
- Reflex 2.0 auto-adjust — the same auto-adjust technology rolled out across the entire 2026 range
Who It’s For
The Zenith Mk4 isn’t really a light you buy instead of a handlebar light — it’s the one you add alongside it. Pair it with a fixed light like the Exposure Six Pack Mk15 or MaXx-D Mk17 and you get both a strong, steady beam down the road and a light that swings to wherever you turn your head, which matters far more than it sounds on twisty lanes, roundabouts and anywhere you’re scanning the verge for potholes or debris. At £249.99 (RRP £295), it’s the most affordable light in this part of Exposure’s 2026 range, which makes sense given it’s designed as a complement rather than your only light. If you’re already running the Toro Mk16 that we reviewed separately, the Zenith Mk4 is a natural second light to add for winter training rather than a replacement for it.
Buying Tips
- Buy the Zenith Mk4 as a second light alongside a handlebar light, not as your only source of illumination — its job is to complement a fixed beam, not replace it
- Because it ships with both mounts, you can also run it solo on the bars if you ever want a lighter single-light setup
- All 2026 Exposure lights share USB-C charging, so a helmet light and handlebar light from the range can share the same cable
- See our guide to the best triathlon bike lights for early morning training for how a helmet-and-bar combo compares with a single powerful front light
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