Test/Review of 17mm CC 2600mA LED Driver 2 Group Mode, 3-4.2v, 2.6A, XM-L

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HKJ
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Test/Review of 17mm CC 2600mA LED Driver 2 Group Mode, 3-4.2v, 2.6A, XM-L
17mm CC 2600mA LED Driver 2 Group Mode, 3-4.2v, 2.6A, XM-L

DSC_4901 DSC_4902
DSC_4903 DSC_4904
DSC_4905 DSC_4906

Driver is from lck-led.com

Official specifications
  • Suitable for one 18650 or 26650 battery
  • Input voltage: 3v-4.2volt
  • Current and Modes: 2 Group / 5 level
  • 1. High (2.6A) - Low (150mA) - Strobe - SOS
  • 2. High (2.6A) - Low (150mA)
  • With Mode Memory
  • Constant current circuit
  • Highly efficient
  • Memory function
  • Diameter: 17mm
  • Total height: 6.25mm
  • Gold plated contacts
  • Low voltage protection: if below 3V, the light will step down to low mode and start flashing


Runing 5 seconds on Low mode the light will flash, then you can change group by turning off and on.



Measurements

Type: LD25, CHLD-25
Diameter: 15.8mm + 17mm
Height: 6.4mm
Driver is linear.
Driver has memory.
A short off/on selects next mode.
Driver uses linear regulation.
Driver has two mode groups:
Group 1: Low, medium, high
Group 2: Low, medium, high, strobe, sos
Strobe is 15Hz with 35% duty cycle.



High

17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20HL

Being a linear driver the led current and the input current is basically the same and the efficiency will be very high as long as the input voltage is at or below the leds Vf.
The driver drops to medium mode at about 3.3 volt and at about 2.85 volt it starts flashing a battery low warning.

17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20HLDriver
17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20HLLed

17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20LH

Starting with a low voltage and increasing it, the driver does never leave battery warning mode.

High

Being a linear driver the output is very smooth.

Warning%202.85V

The battery warning signal is fading off/on every 3. second.



Medium

17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20medium%20HL

In medium the led Vf is considerable lower and the driver stabilizes the brightes at a lower voltage..

17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20medium%20HLDriver
17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20medium%20HLLed

Medium

Again the output is very smooth.



Low

17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20low%20HL

In low mode the efficiency starts dropping very soon, due to the low Vf of the led.

17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20low%20HLDriver
17mm%20CC%202600mA%20LED%20Driver%202%20Group%20Mode,%203-4.2v,%202.6A,%20XM-L%20low%20HLLed

Low

And again a very smooth output.



Strobe

Strobe

Strobe is 15Hz with 35% duty cycle.



SOS

SOS



Conclusion

This looks like a fairly well designed linear driver that is using a power transistor for regulation and not the usual 7135 chip.
It is necessary to be a bit careful when selection batteries, i.e. do not use batteries with 3.0 as minimum voltage, it is best to use batteries with 2.5 as minimum. This is not really a problem, because 2900/3100/3400mAh are all min. 2.5 volt batteries.



Notes

I am not very impressed with lck-led's custom service. I got one wrong driver and one driver that were far outside specifications. I have sent a couple of emails to them, I got one question back after two weeks: did I want money back or a new driver. There was no explanation if it covers one or both of the problems and I do not know if they have sent me a new driver (That was my answer).

How do I test a led driver
List of all tested drivers

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

koyotee
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Again, thanks for the review! Can the amps be bumped up, by swaping the current limiting resistor?

Finaly, proud owner of a Powerex Maha mh c-9000 for my Eneloops:)

HKJ
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koyotee wrote:
Again, thanks for the review! Can the amps be bumped up, by swaping the current limiting resistor?

I would expect that is possible.

The sense is the R025 resistor.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Gloh
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Hi Hkj
I recently installed this driver into a C8. Was using a 3100mAh Nitecore at 3.8V and noticed that it stepped down from high to low after running it on high for a minute or so. When it did, the low mode was blinking.
This means it’s less than 3V but I checked with the DMM and clearly said 3.8V. Any ideas why?

WarHawk-AVG
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Nice review…thanks

HKJ
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Gloh wrote:
Hi Hkj I recently installed this driver into a C8. Was using a 3100mAh Nitecore at 3.8V and noticed that it stepped down from high to low after running it on high for a minute or so. When it did, the low mode was blinking. This means it's less than 3V but I checked with the DMM and clearly said 3.8V. Any ideas why?

 

Could it be an old battery, that had a high internal resistance?

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Gloh
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Very unlikely. Only recharged it maybe 5 times since opening it from packet and even then, never ran it down fully.

Works perfectly fine in other flashlights.
Could it be an issue with the driver? A short of some sort? Everything else works fine though.

HKJ
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Gloh wrote:
Very unlikely. Only recharged it maybe 5 times since opening it from packet and even then, never ran it down fully. Works perfectly fine in other flashlights. Could it be an issue with the driver? A short of some sort? Everything else works fine though.

Other possibilities are a "bad" connection between battery and driver (Maybe the switch) or a faulty driver.

 

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

WarHawk-AVG
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Could be a bad diode…I remember reading somewhere bad diodes were causing Nanjg’s to flash low volts on fresh charged Li Ion’s

Gloh
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HKJ wrote:

Gloh wrote:
Very unlikely. Only recharged it maybe 5 times since opening it from packet and even then, never ran it down fully. Works perfectly fine in other flashlights. Could it be an issue with the driver? A short of some sort? Everything else works fine though.

Other possibilities are a “bad” connection between battery and driver (Maybe the switch) or a faulty driver.

 

Even something like a poorly attached spring? Could that cause voltage loss?

HKJ
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Gloh wrote:
Even something like a poorly attached spring? Could that cause voltage loss?

It could, but I would say it is unlikely, due to the tension there are on the spring and connections.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Gloh
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Ok i figured out the issue.

When screwing the lens/reflector down, the gasket did not fully cover the soldering joints of the terminals and it ever so slightly touched the reflector.
Whilst it did not fully short, I discovered the more I screwed the top down, the more it affected the dimming and the eventual shorting of the LED.
I filed the solder joints down and put a new gasket and it seems to work fine now.