Overview & First Impressions
Porcelain is judged in the kiln, where a few degrees decide whether a glaze sings or crawls, and the only way to learn the difference is to look carefully under good light. Inspection is a lighting problem before it is an eyesight problem. The Klarus RS20UV carries a 1050 lumen main beam plus a dedicated ultraviolet emitter, and it is built for exactly that kind of close examination rather than for throwing a spot across a field.
Materials & Construction
The body is aluminum with a hard anodized finish that resists the pocket wear that eventually polishes cheaper lights to a shine. A sealed charging port and gasketed tail cap keep water out of the battery compartment, which matters because the ultraviolet emitter is often used close to wet surfaces. The reflector is cut for a broad hotspot rather than a long throw, and the lens is coated to keep output loss low across the dual emitter arrangement.
Design & Details
Dual emitters need a clean interface or they confuse the user, and Klarus solves it with a deliberate mode sequence rather than a hidden menu. The main beam steps through useful levels, the UV channel is separate, and the switch is shaped so a thumb can find it without looking. As an EDC flashlight it is on the larger side, but the body is slim enough for a jacket pocket and the clip actually holds a seam.
Real-World Use
Used for inspecting knife edges, checking for fluorescence on documents and materials, and lighting a workbench in a dim room. The UV channel is the standout: it reveals dried residue and adhesive on a blade that a white light hides completely. The main beam is bright enough for a walk to the shed without washing out close work, and runtime held up through an evening of intermittent use on a single charge.
Ownership Notes
Owners of locking folding knives will find the UV channel genuinely useful for checking for residue in a pivot or a lock track. EdcMall stocks the Klarus flashlights range and the rest of the shop's tools together, so a light and a blade can be chosen as one kit rather than two separate purchases. Buyers should note that UV output is not for staring at; use it on surfaces, not eyes, and keep it away from skin for long periods.
Who Is This For?
This suits technicians, collectors and hobbyists who need to look closely at surfaces rather than illuminate a treeline. It fits anyone who inspects blades, seals or documents. Anyone who keeps EDC knives sharp will get more from the UV channel than they expect. It is the wrong light for a ultralight hiker counting grams, and someone who only needs a beam for a nightly dog walk will be paying for a channel they never use.
Final Verdict
The RS20UV is a specialist tool that doubles as a competent general light. The main beam is honest about its 1050 lumens, the UV channel does work no white light can do, and the build is sealed against the conditions these tasks happen in. If inspection is part of your week, this is a sensible purchase rather than a gadget.
