The flashlight was sent to me by Convoy for review.
Here’s the product link: Convoy S21F (non-affiliate)
The flashlight comes with a nice black, matte anodization.
The body of the light contains some patters to enhance the grip, while the head has some heatsinking built into its design.
It’s operated via an electronic switch that’s mounted on the lower portion of the flashlight’s head.
The switch is covered by a rubber boot which contains a translucent circular section.
An indicator LED will light up while the flashlight is turned on to indicate the battery’s state.
Opposite to the switch there’s the charging interface.
It’s sealed from dust and moisture via a rubber flap.
A normal Type-C port is used for charging the flashlight.
While charging, the indicator LED of the switch will shine to show the charge’s state.
On the front portion of the head, we can see a polished aluminum bezel, which helps protect the glass lens of the light.
The Convoy S21F uses a quad 60 degree TIR reflector and 4 x Nichia 519A emitters.
The setup of thε light is very interesting, since it uses 2 x 5700k + 2 x 2700k Nichia 519A LEDs.
Of course, the head can be easily taken apart, since it’s not glued.
Here’s the quad TIR along with the glass and the rubber o-ring that’s housed into the head.
And here’s a closer look at the PCB.
As you can see, there’s two pairs of leads attached on the PCB, which allows the emitters to light up in pairs.
Plenty of thermal paste is in place.
On the back side of the head, we can see the Convoy branded driver, which is held in place via a brass retainer.
A thick spring is used as the positive terminal.
The tail of the S21F is completely flat, which allows it to tail stand.
It also includes a hole on its side to allow the user to install a lanyard.
Inside the tail we find a thick spring that’s help in place with a brass retainer.
Both threads are very cleanly cut.
The rear threads are also anodized, which allows the flashlight to get mechanically locked out via slightly untwisting the tail.
The bundle I got also came with an EVE 50E 21700 battery included.
The cell is flat top and seems to be more than capable to fulfil the power needs of the flashlight.
User Interface
The Conovy S21F comes with a very interesting setup.
As already mentioned, it comes with 2 x 2700K + 2 x 5700K Nichia 519A High CRI emitters.
What is very exciting is that the user can select any colour temperature between those two values, since the driver allows for configuring what percentage each emitter pair will contribute to the final output.
Here’s all the supported actions by the flashlight’s firmware:
Turn on/off: Single press.
Ramp up/down: Long press while on. Releasing and long pressing again will alter the direction of the ramp. Ramping is supported while the stepless dimming mode is selected.
Mode cycle: Long press while on (1% > 10% > 40%> 100% > 1% > …). The 4 modes are accesible when the UI has been switched to the regular mode setting.
Turbo: Double press.
Moonlight: Long press while off.
Change colour temperature: press and long press while on. The light will slowly shift from warm to cool. Re-doing the same, which alter the direction of the shift. Release to select
Tactical mode: 4 clicks while off.
Voltage detection: 5 clicks while off.
Stepless dimming / Regular modes switch: 6 clicks while off.
Lock / Unlock: 10 clicks while off.
Output
Here’s my output measurements along with the current draw per each output level.
As we can see, the Convoy S21F pushes 1809 lumen of High CRI light.
Mode spacing looks pretty good, though a lower moonlight would be a nice thing to have.
Of course, since the firmware supports stepless dimming, the user is free to select any output between Moonlight and Turbo.
Power Regulation
Here’s a power regulation graph I created using my bench power supply to demonstrate how the drive copes with different input voltages.
What we can see in the graph:
- The flashlight demonstrates great signs of regulation.
- Turbo is fully regulated down to 3.7V
- High is regulated down to 3.6V
- All the rest of the modes are regulated for the full span of the battery’s voltage.
Output Beamshots
Finally, here’s some outdoor beamshots of the Convoy S21F.
