OKNIFE LK: M390 Folder With a 400-Lumen Light

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OKNIFE launched the LK on last month, and it’s an easy one to do a double take on: a folding knife with a full flashlight built into the handle. Up front is a Böhler M390 blade, and at the opposite end sits a 400-lumen USB-C light, so the tool reads as two everyday-carry staples fused into one body. It’s the kind of combination that usually ends up a gimmick, which is what makes the execution worth a closer look.

Price: $124.95
Where to Buy: Amazon

The pedigree helps explain the ambition. OKNIFE is part of Olight’s O-Family, so the lighting side here isn’t an afterthought bolted onto a knife. The LK lists at $124.99 in a MAO Desert White finish, a price that tracks the M390 steel more than the two-in-one novelty.

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OKNIFE LK Specs at a Glance

At a glance, the LK has a 2.48-inch blade made from Böhler M390 steel, which keeps a sharp edge for a long time. The blade has a Tanto shape with a strong tip and a sharp factory edge.

The handle is aluminum with a Desert White finish. It opens with a flipper and a button lock, rides on smooth ceramic bearings, and has a clip for right-side carry.

On the other end is a flashlight that puts out 400 lumens of cool white light and reaches about 110 meters. It charges over USB-C in about 60 minutes, runs up to 13 hours, and adds RGB modes like White Flood, Breathing, and a red beacon.

The knife weighs 3.03 ounces (86 g) and is water-resistant, with an IPX5 rating and a 1-meter drop rating. It costs $124.99 in Desert White and comes with a 2-year warranty and a 30-day money-back guarantee.

What OKNIFE Built Into the LK

The pitch is one tool doing two jobs without the bulk of carrying both. OKNIFE describes it as a 2-in-1 minimalist design, with the knife and the light meant to be used separately rather than together.

The blade deploys from a flipper tab backed by a button lock, riding on a caged ceramic ball-bearing pivot. The light sits at the base of the handle, not over the blade.

OKNIFE says it placed the light there on purpose, to avoid glare and keep cutting tasks stable. The flat bottom also lets the LK stand upright as a small area light.

The M390 Blade, and a Spec Sheet That Disagrees With Itself

The steel is the headline material. OKNIFE uses Böhler M390, a powder steel known for strong edge retention, hardened to 60 to 63 HRC on the technical sheet. The grind is an eight-surface flat with a satin finish, and the factory edge runs 18 to 22 degrees.

The blade is compact at 2.48 inches, with a 0.10-inch stock thickness. That short length is a direct trade for the battery and light packed into the handle, something OKNIFE addresses in its own FAQ.

One thing buyers should know is that OKNIFE’s own listing contradicts itself on the blade. The product bullets, the marketing copy, OKNIFE’s Amazon listing, and Olight’s store all describe it as a Tanto with a reinforced tip, while only OKNIFE’s technical specification table mislabels it as a drop point.

It’s best understood as a Tanto, since that’s what every customer-facing description and the Amazon spec table show. Hardness shows the same split, reading 60 to 63 HRC in the spec table and 61 to 63 HRC in the marketing copy, so the more conservative 60 to 63 HRC is the safer figure to cite.

A 400-Lumen Light in the Handle

The main emitter is a 6500K cool white LED rated at 400 lumens, sent through a high-transmittance PMMA lens. OKNIFE lists a 110-meter throw and 3,000 candela of peak intensity for the main beam.

Power comes from a 340 mAh cell that charges over USB-C at 5V/1A, with a full charge taking about 60 minutes. Maximum runtime is rated at 13 hours, and the charging port uses an open design that OKNIFE says is internally waterproofed, so it skips the usual rubber plug.

The RGB Modes Are the Unusual Part

Beyond the white beam, the LK carries a separate RGB module with several modes. OKNIFE lists a White Flood mode for soft fill light, plus Sequential Chasing and Breathing effects for ambient lighting.

Two of the modes have a clearer use case. A Constant Red mode and a Red Beacon are built in for signaling and for preserving night vision, both carried over from OKNIFE’s flashlight side.

All of this makes the LK’s lighting unusually deep for a folding knife. OKNIFE treats the white and red modes as the working tools and the chasing and breathing effects as ambient extras.

Size, Build, and Water Resistance

The LK is built around 6061-T6 aluminum with a scratch-resistant Micro-Arc Oxidation finish in MAO Desert White, and the tip-down, right-carry clip is fixed because the base of the handle holds the light and charging port. By OKNIFE’s spec sheet, it measures 6.30 inches (159.9 mm) overall and folds to 3.82 inches (97 mm) closed. Weight is 3.03 ounces (86 g) by the spec table and Amazon listing, though some marketing copy rounds it to 3.07 ounces (87 g). The build carries an IPX5 water-resistance rating, survives a 1-meter impact, and runs from 0 to 40°C.

Price and Availability

The LK sells for $124.99 in a MAO Desert White colorway, with a 2-year warranty and a 30-day money-back guarantee through OKNIFE. The box includes the knife with clip, a USB-C to USB-C cable, and a manual, and origin is listed as China.

It’s also sold through OKNIFE’s Amazon storefront, so US buyers have a second pickup option. Direct orders over $49 ship free within the US. OKNIFE also lists a lower-cost LK Zombie Green at $79.99, and the gap from the Desert White suggests a step down in blade steel, though OKNIFE’s listing doesn’t confirm it.

Who the LK Is Aimed At

OKNIFE positions the LK for the minimalist carry crowd, people who would rather pocket one object than two. The 2.48-inch blade is short for hard-use cutting, and OKNIFE is upfront that the blade and light are meant for separate use.

For anyone who already carries a dedicated knife, the LK leans more toward a light with a backup blade than the other way around. M390 is a premium steel, and the knife uses a caged ceramic ball-bearing pivot on the cutting side, even with the short edge.

Price: $124.95
Where to Buy: Amazon

At $124.99, it sits in mid-tier EDC pricing, where the draw is the two-in-one design as much as the cutting hardware. How the integrated light and exposed port hold up over years of pocket carry isn’t something the spec sheet can answer.