Nitecore T4K Rechargeable Torch 4000 Lumen Turbo Super Bright Small Flashlight, Protective Case Included

Product Information

The Nitecore T4K keyring light has an incredible maximum output of 4000 lumens from the 4 x Cree XP-L2 V6 LEDs and is powered by a built-in, 1000mAh li-ion battery. The flashlight is rechargeable via a USB-C port at the base of the torch and comes with a USB-C to USB charging cable. It’s pretty compact and lightweight at only 75g but its huge head and deep smooth reflector gives it a throw of a quite staggering 585 metres with an intensity of 85000 candela! DMM: UNI-T UT139C and UNI-T UT210E – 16AWG wire is used directly into the 139C via some banana plugs, and 8AWG wire in a loop for the UNI-T. The DMM I use depends on how high the expected current will be – I use the 139C for <10A, and the 210E for >10A.

A full charge takes around 2 hours and the side switch status LED will change from red to green. Only the lowest eco mode is available whilst charging – with a long press of the side switch. I measured 4180K for the LEDs with a pretty neutral tint and a very high 95 CRI. They’re behind a TIR or Total Internal Reflection lens and I measured a throw of 104m with a beam intensity of 2700 candela. It’s less than what’s quoted in the manual but still a useful throw for a small torch like this. Again if you’re unfamiliar with any of these terms, I explain them in detail in my previous video. And the torch does come with a better than average IP68 dust and waterproof rating like the two Fenix torches in this roundup. The battery’s red turns green when the battery is fully charged.

Brightness modes and max runtimes

Lux Meter: For lumen readings and runtimes, an Adafruit TSL2591 connected to a Raspberry Pi running Ubuntu, using RuTiTe by bmengineer in a custom sphere (build document coming soon, when I have some more time). A UNI-T UT383S is used for candela readings. An Adafruit MCP9808 rounds out the list for temperature monitoring. Some pictures have been adjusted slightly to depict as close as to what is seen in real life. The distance of the light from the door is 4.6m. It’s important to realize that the built-in 1000mAh battery in the Nitecore T4K is not user replaceable. This is disappointing because it essentially means that the flashlight because trashcan fodder once the battery no longer holds a charge. There’s a few torches that didn’t make this top ten but deserve a mention. The Olight Baton 3 Pro is the most compact 18650 torch I’ve tested and almost the perfect EDC torch. Olight Baton 3 Pro (natural white version) in turbo mode Olight doesn’t specify the LED used but it sits behind a TIR optic and the beam has a good mixture of throw and spill for an EDC torch. There’s a noticeable hotspot with 220 metres of throw and 12300 candela of intensity in turbo mode.

The Nitecore T4K has a multifunctional OLED display, well readable, which shows us in real time some data such as lumens, battery voltage, runtime etc. Although it is crazy bright, you aren’t going to be using turbo mode very often because it’s designed to only shine for 10 seconds at a time before it turns off automatically. What I like The interface is very easy to use. Press the power button to turn it on and then the mode button to cycle from ultralow 67 hour 1 lumen mode, to 21 hour 15 lumen low mode, 7 hour 65 lumen mid mode and the 2 hour 45 minute 200 lumen high mode. Press and hold the mode button with the torch on or off for the headline grabbing 4000 lumen turbo mode which is insanely bright for any torch let alone one this size. Press and hold the power button with the torch off to access ultralow mode. There’s no strobe function. The display shows the brightness level and time remaining for each mode. In turbo there’s a countdown progress bar that lasts up to 10 seconds depending on the temperature of the torch. You can keep pressing it but the torch gets very hot and the turbo lasts a progressively shorter time.Let’s take the light party outdoors now. I took the picture above around 9:30pm at night and the light through the trees was not noticed by my naked eyes.

Note: The stated data is measured using the built-in Li-ion battery (1,000mAh) under laboratory conditions. The data may vary in real world use due to different battery usage or environmental conditions. Turbo can be called up almost until the low battery flashes. I got to operate it for about ten seconds with the T4K display showing 3.40V. This behavior of the T4K is excellent. It does get quite hot – I measured over 50°C at the head but even the body gets quite warm in turbo mode. It does become a nice hand warmer though on a winter walk. The charging light turns from red to green when it’s fully charged. You can use the moonlight, low and medium modes whilst it’s charging.The T4K arrived in a slightly different box than I’m used to with Nitecore lights – usually, I would be expecting a box that can be hung up on a retail wall-and-hook arrangement, but this has come in a box that’s more designed for displaying directly on a shelf. Pushing the mode selection button brings up a battery level meter that tops out around 4.2v, which is the Li-ion standard for max charge. Nitecore has also built over-charge protection into the T4K, as well as over-discharge protection. The flashlight is sealed and tightened down with 8 screws from factory – disassembly is not recommended. Note: *Turbo mode is a manually operated momentary function and therefore a run-time is not available. LED. Ті, хто знайомий з таким пристроєм, можуть дати про нього лише позитивні відгуки. Тому всілякі технології і сучасні матеріали, які втілені в ньому, це не просто маркетингові дослідження, а дійсно практичні іфункціональнірішення професійного виробника.