Overview & First Impressions
The E5 Ultra is Klarus's flagship flat carry light, and the specification explains why the company calls it that. Inside an ultra-slim body it integrates three separate light sources: a high-output white primary, an auxiliary warm flood, and a tactical red mode. Output reaches 800 lumens, which is a sensible ceiling for a body this thin, and the dual-button interface handles switching with intelligent memory so the light returns to the level you last chose. Flat EDC lights are a crowded category, but few combine this much optical variety with a profile that still sits flush against a pocket seam.
Build Quality & Materials
The chassis is a streamlined flat housing with a heavy-duty magnetic base, which turns any steel surface into a mounting point for hands-free work. Fast Type-C charging and robust weatherproofing make the platform genuinely outdoor-capable rather than a desk accessory, and the aluminium body keeps the weight low enough that the light disappears on the way out. Because the three emitters are separate rather than filtered from one source, each can be optimised for its own job, which is why the warm flood is comfortable to read by and the red remains genuinely red. Nitecore flashlights have driven flat-format development hard, and the E5 Ultra answers with optical flexibility rather than raw output.
Design & Craftsmanship
Two buttons carry the whole interface: one for the primary white output, one for the auxiliary sources, with memory retaining your last selection. That split is the reason the E5 Ultra avoids the usual multi-emitter trap, where reaching a secondary mode means clicking through a long sequence. The magnetic base is strong enough to hold the light vertically on a fridge door, a steel shelf or a car panel, and the pocket clip keeps the body secure when carried. The E5 Ultra also inherits design language from the rest of the Klarus E8 series family, which shares the same emphasis on flat, pocketable geometry. Everything about the shape is decided by carry comfort.
Performance & Real-World Use
Daily use falls into three patterns. The primary white beam handles general tasks with enough reach for a car park or a corridor. The warm flood is the one you will end up using indoors, because it lights a room or a page without the harsh glare of a cool emitter. The red mode preserves night vision for camping, dark-adapted work and vehicle interiors, where white light would ruin your eyes for twenty minutes. With the magnet engaged the light works hands-free on any steel surface. As an EDC flashlight it is one of the least intrusive ways to carry 800 lumens.
Carry & Ownership Notes
Runtime on the mid settings covers an evening of intermittent use, and Type-C charging means the E5 Ultra tops up from the cable already in your bag. The flat profile also means it stands on its own base without rolling away, a small detail that flat-light owners appreciate far more than reviewers do. Because the auxiliary emitters draw little current, the warm and red modes continue long after the primary has stepped down. For anyone building a single-light kit, EdcMall stocks the E5 Ultra as the flat option that covers the most situations. Within the Klarus flashlights range the E5 Ultra is the most versatile flat-body option, and it is the one most buyers keep in a pocket long after the novelty of the auxiliary modes has worn off.
Who Is This For?
Buy it if you want a genuinely slim carry light with a warm reading mode, a night-vision-friendly red output and a magnet that makes hands-free work effortless. Skip it if your priority is maximum throw, because the E5 Ultra is engineered for close and mid-range versatility instead.
Final Verdict
The E5 Ultra is what happens when a designer refuses to choose between flat carry and optical flexibility. Three sources, two buttons, one magnet, and a body you will forget is in your pocket.
