[Review] - Convoy 3X21C SST40 21700 - by Lock


Newly Enlightened
Jan 10, 2017

Unboxing and Contents


The Convoy 3X21C SST40 21700 flashlight comes packaged in a no-nonsense, practical box that emphasizes the flashlight's utility. Inside the box, you'll find the following components:

  1. Convoy 3X21C SST40 21700 flashlight
  2. Spare o-rings
  3. Lanyard
Before we delve deeper into the flashlight's features and performance, it's worth noting a crucial detail for potential users. When storing the flashlight in a bag or backpack, be sure to loosen the connection between the battery tube and the head. Failure to do so could result in accidental activation, potentially leading to damage or even a fire hazard. Additionally, the flashlight requires charging via a TYPE-C interface, with a recommended charging current of 3A. To charge the battery, you'll need a TYPE-A to TYPE-C cable and a 5V adapter.





Technical Specifications

Before we explore the Convoy 3X21C's performance in real-world scenarios, let's take a closer look at its technical specifications:

  • Material: Aluminum alloy
  • Low Voltage Warning: Automatic shutdown
  • Reverse Polarity Protection: None; the positive side of the battery should face the head
  • Lens Type: AR-coated glass lens
  • Reflector: Orange peel reflector
  • Charging: TYPE-C charging interface (3A charging current)
  • Switch Location: Side switch on the head
  • Mode Memory: Yes
  • Tail Stand: Yes
  • Battery Included: No
  • Required Battery Type: 3 * 21700 batteries (unprotected)
  • Luminous Flux: 15000LM
  • Color Temperature (Tc): 6500K/5000K
  • Output Current: Max 54A FET
  • Head Diameter: 74mm
  • Battery Tube Diameter: 50mm
  • Flashlight Length: 148mm
  • Product Weight: 536g (including the handle)
  • Weight with Box: 621g
Operating Instructions

Understanding how to operate the Convoy 3X21C flashlight is essential to fully unlock its potential. Here are the operating instructions for various modes and functions:

Basic Operation:

  • Single click the button to turn on the flashlight. The flashlight will activate with the last used brightness level.
  • Press and hold the button to increase the brightness level.
  • Release and press the button again to decrease the brightness level.
Moonlight Mode:

  • With the flashlight off, press the button once to activate Moonlight Mode, which provides 0.2% brightness (this low level may not be easily visible).
Turbo Mode:

  • With the flashlight on or off, double-click the button to activate Turbo Mode, providing 100% brightness.
Strobe Mode:

  • With the flashlight off, triple-click the button to activate Strobe Mode.
Tactical Mode:

  • With the flashlight off, quadruple-click the button to activate Tactical Mode, providing 100% brightness.
  • To exit Tactical Mode, quadruple-click the button again.
Voltage Detection Mode:

  • With the flashlight off, five-click the button to enter Voltage Detection Mode. (* indicates "flash," *** indicates 3.7V).
Lockout Mode:

  • With the flashlight off, ten-click the button to activate Lockout Mode. The flashlight will flash once to indicate it is locked.
  • To exit Lockout Mode, ten-click the button again. This is the only way to unlock the flashlight.
It's worth noting that the Convoy 3X21C flashlight features low voltage protection and temperature control to ensure safe usage.

Performance and Practical Applications

With a clear understanding of its technical specifications and operating modes, let's dive into the real-world performance and practical applications of the Convoy 3X21C SST40 21700 flashlight.

Illumination Power

One of the standout features of the Convoy 3X21C is its impressive luminous flux of 15000LM. This flashlight is a true powerhouse when it comes to illumination, making it suitable for a wide range of scenarios. Whether you're exploring the great outdoors, conducting search and rescue operations, or simply navigating in the dark, the Convoy 3X21C ensures you have ample light to see clearly.







Color Temperature Options

The Convoy 3X21C offers flexibility when it comes to color temperature, with options for 6500K and 5000K. This allows users to tailor the flashlight's light output to their specific needs. The 6500K option provides a cooler, more bluish-white light, while the 5000K option offers a warmer, more natural light that's easier on the eyes. This versatility ensures that the flashlight can be used effectively in various situations.




Battery Life and Configuration

To power its impressive output, the Convoy 3X21C requires three 21700 batteries (unprotected). While this configuration may add some weight to the flashlight, it also extends its runtime, ensuring that you won't run out of power during extended outdoor adventures or emergency situations. It's important to note that the batteries are not included with the flashlight, so users must acquire them separately.







User-Friendly Interface

The flashlight's user interface is designed for ease of use. The side switch on the head of the flashlight provides quick access to various brightness levels and modes. The inclusion of a memory function ensures that the flashlight will remember your last-used brightness level, saving you from the hassle of cycling through modes to find the desired setting.


Versatile Operating Modes

The Convoy 3X21C offers a range of operating modes to cater to different scenarios. Moonlight Mode provides an incredibly low brightness level, ideal for preserving night vision or discreet use. Turbo Mode unleashes the full power of the flashlight for situations that demand maximum illumination. Strobe Mode can be useful for signaling or disorienting potential threats. Tactical Mode provides instant access to maximum brightness for tactical applications.

Safety Features

The flashlight's safety features, including low voltage protection and temperature control, ensure that you can use it with confidence. The low voltage protection prevents the batteries from being drained to a dangerous level, protecting both the batteries and the flashlight itself. Temperature control helps prevent overheating, which could potentially damage the LED or other components.


In conclusion, the Convoy 3X21C SST40 21700 flashlight is a remarkable and versatile illumination tool that offers exceptional performance across a wide range of applications. Its combination of high luminous flux, color temperature options, user-friendly interface, and safety features make it a compelling choice for both outdoor enthusiasts and professionals in need of a reliable lighting solution.

However, potential users should be aware of the flashlight's power and take precautions when storing or handling it, as accidental activation could lead to undesirable consequences. Additionally, acquiring the required 21700 batteries separately is essential for enjoying the flashlight's extended runtime.

The Convoy 3X21C is a testament to Convoy's commitment to providing high-quality flashlights that meet the diverse needs of users. Whether you're embarking on an adventure in the wilderness or preparing for emergency situations, this flashlight is ready to light your way with its impressive brightness and functionality.

So, if you're seeking an illuminating powerhouse that doesn't compromise on performance, the Convoy 3X21C SST40 21700 flashlight is a beacon of light you can count on. Illuminate your path and seize the night with this exceptional flashlight.




Aug 27, 2006
Love that it comes with a carry-handle.
Unfortunately I already purchased a somewhat compact Search light just yesterday after finding some extra Mad-Money I didn't know I had.