Overview & First Impressions
Two Klarus lights that share a naming convention and almost nothing else. The RS20UV is a professional inspection tool that pairs a 1050 lumen white beam with a dedicated ultraviolet emitter, while the RS10 is a multifunction spotlight, camping lantern and power bank rolled into one body. Both are aimed at people who need a specific capability rather than general illumination, and both are considerably more useful than their modest output figures suggest.
Materials & Construction
Both bodies are machined aluminium with a hard anodised finish and sealed against weather, which suits a light that will be used in garages, workshops, boathouses and campsites. The ultraviolet emitter behind the RS20UV's secondary lens requires a dedicated driver that holds a stable wavelength, which is why UV lights cost more than their lumen figure implies. Klarus flashlights in this range run on rechargeable cells and can act as power sources for other devices.
Design & Details
The RS20UV's design is driven by inspection work: a focused white beam for examining surfaces and a UV flood for revealing what the eye cannot see, from coolant leaks and hydraulic fluid to scorpions, pet stains and forged documents. The RS10 instead spreads its output through a diffusing lantern section, giving a soft area light for a tent or a table, and includes USB output to top up a phone. Two very different tools built for two very different problems.
Real-World Use
The UV torch is a specialist instrument for mechanics, HVAC technicians, pest inspectors, mineral collectors and anyone checking currency or documents. The RS10 is the light you take camping: hang it from a loop, light the whole table and charge a phone overnight without carrying three separate devices. Neither replaces a compact EDC flashlight for pocket duty, and both are best understood as task lights that solve one problem extremely well rather than doing everything adequately.
Ownership Notes
Ultraviolet light has real safety considerations. Never look directly into a UV emitter, keep it away from skin during long exposures and use eye protection when working close to a reflective surface. Store the RS20UV lens-side down to protect the UV filter. Fenix flashlights and Jetbeam flashlights with UV or coloured emitters carry the same warnings. The RS10 simply needs its cell kept above half charge and its diffuser wiped clean.
Who Is This For?
Buy the RS20UV if your work involves leak detection, pest inspection, mineral hunting or document verification, and treat it as a professional instrument rather than a pocket light. Buy the RS10 if you camp, road-trip or need a light that doubles as a phone charger. Owners who want one light to cover both roles will be disappointed by either; Nitecore flashlights and other brands with swappable heads also fail to do this well.
Final Verdict
These two lights are proof that the most useful products are often the most specialised. The RS20UV is a genuinely capable inspection tool with a properly implemented UV emitter, and the RS10 is one of the more practical camping lights you can buy because it consolidates a lantern and a power bank. Buy the one whose job matches yours, and it will earn its place in your kit rather than your drawer.
