Wurkkos WK03 SST40 18650 Torch

The Wurkkos WK03 SST40 Torch is a high-performance, compact flashlight engineered for users who prioritise maximum brightness and extended runtime in a lightweight, durable design. With its powerful Luminus SST40 LED emitter, this model delivers exceptional output—up to 1800 lumens in turbo—making it ideal for long-distance visibility, trail navigation, or emergency lighting. The beam profile, shaped by a precision TIR lens, provides a clean, focused throw with a strong central hotspot and minimal spill, ideal for spotting distant objects or illuminating wide terrain.

The flashlight features a built-in USB Type-C charging port on the head, allowing for convenient charging from power banks, laptops, or solar chargers. A full charge takes approximately 2.5 hours, and the battery level is indicated via a smart switch that displays green (good), red (low), or flashing red (urgent recharge) for up to 5 seconds after power-on. This visual feedback ensures you’re always aware of your remaining power.

Safety and reliability are built into every aspect of the design. The WK03 includes reverse polarity protection, automatically cutting power if the 18650 battery is inserted incorrectly. It also features LVP (Low Voltage Protection) and HVP (High Voltage Protection), which automatically shut off the light when voltage drops below 2.7V or rises above 4.35V, protecting both the battery and internal circuitry.

Advanced Temperature Regulation (ATR) technology helps manage heat during prolonged use, preventing overheating and maintaining consistent performance. The multi-mode system includes high, medium, low, strobe, and moonlight settings, with mode memory retaining your last used brightness level in standard modes—making it easy to return to your preferred setting without reprogramming.

However, it's important to note that the Luminus SST40 emitter, while bright and efficient, produces a cooler, bluer light with a slightly greenish tint under certain conditions. Its CRI (Colour Rendering Index) is relatively low, meaning colours may appear less natural under its beam. This is a trade-off for higher output and longer runtime.

For users who value colour accuracy and a more natural, pleasant beam, Wurkkos also offers the WK03 with the Nichia 519A LED. This variant delivers 1200 lumens on turbo (lower peak output) but with superior colour quality, a balanced beam, and a more neutral, natural white light. It’s preferred by enthusiasts who use their flashlight for reading, photography, or detailed tasks where accurate colour representation matters.

In summary, if your primary need is maximum brightness and long runtime, the Wurkkos WK03 with the Luminus SST40 is the optimal choice. If you prioritise beam quality, colour accuracy, and a more balanced, natural light for everyday or precision use, consider the 519A variant instead.

Emitter: Luminus SST40 

Colour Temperature Options: 6000–6500K (cool white) or 5000–5300K (neutral white)

Beam Type: TIR (Total Internal Reflection) lens for focused, even throw

Output: Up to 1000 lumens (high mode)

Battery Type: 1 x 18650 Li-ion rechargeable battery (included)

Weight: 55g (without battery)

Dimensions: 101.5mm (length) × 24.7mm (head diameter)

IP Rating: Not specified (typically IPX4 or similar for splash resistance)