LD-33 Triple XM-L 2.6A 9-17V Circuit board

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Driver is from Intl-outdoor.com

Official specifications:

You can change between the set of modes by turning on the flashlight on low mode for about 3 seconds,the light will flash once, then quickly turn off the flashlight and then turn it on.



Measurements

Tested with: 3 Cree XM-L2 in series.
Diameter 24mm
Max. height: 14.7m
In first mode set the driver has: High, medium, low, strobe, sos
In second mode set the driver has: High, medium, low
The mode set selection is done from high mode.
The driver has memory, the actual mode is stored when the light is off for a short time.
A short off/on will select next mode.
Driver is buck only.
Strobe is 15hz


High

LD-33%20Triple%20XM-L%202.6A%2017V%20HL

With four batteries the driver keeps full output down to about 14.5 volt, then the output drops and at 11.7 volt the low battery warning starts.
The low battery warning will drain the batteries down to 7.5 volt, before it turns off.

LD-33%20Triple%20XM-L%202.6A%2017V%20HLDriver
LD-33%20Triple%20XM-L%202.6A%2017V%20HLLed

LD-33%20Triple%20XM-L%202.6A%2013V%20HL

With 3 batteries, the driver will first drop in power at 10V and start warning flashing at 9 volt.
As with 4 batteries the low battery warning will drain the batteries down to 7.5 volt, before it turns off.

LD-33%20Triple%20XM-L%202.6A%2013V%20HLDriver
LD-33%20Triple%20XM-L%202.6A%2013V%20HLLed

High%2014.4V
High%2010.8V

There is a slight difference in the buck frequency, depending on number of batteries.

Warning%2011V
Warning%208.7V

The low voltage warning is not a fast flashing, but a slow (2 sec cycle time) ramping up and down.



Medium

LD-33%20Triple%20XM-L%202.6A%2017V%20HL%20medium

On medium the light does not step down, but goes directly to warning flashes.

LD-33%20Triple%20XM-L%202.6A%2017V%20HL%20mediumDriver
LD-33%20Triple%20XM-L%202.6A%2017V%20HL%20mediumLed

LD-33%20Triple%20XM-L%202.6A%2013V%20HL%20medium

This works the same way with 3 batteries.

LD-33%20Triple%20XM-L%202.6A%2013V%20HL%20mediumDriver
LD-33%20Triple%20XM-L%202.6A%2013V%20HL%20mediumLed

Medium%2014.4V
Medium%2010.8V



Low


LD-33%20Triple%20XM-L%202.6A%2017V%20HL%20low

In low mode the efficiency goes down, due to the drivers own power consuption.
Also note that warning flashes increases the current consumption.

LD-33%20Triple%20XM-L%202.6A%2017V%20HL%20lowDriver
LD-33%20Triple%20XM-L%202.6A%2017V%20HL%20lowLed

LD-33%20Triple%20XM-L%202.6A%2013V%20HL%20low

In low mode the 3 battery curve does not start at 13V, but at 12.8V. There is a reason for this, the 3/4 battery threshold is just below 12V in low mode.

LD-33%20Triple%20XM-L%202.6A%2013V%20HL%20lowDriver
LD-33%20Triple%20XM-L%202.6A%2013V%20HL%20lowLed

Low%2014.4V
Low%2010.8V



Strobe

Strobe%2014.4V
Strobe%2010.8V

With strobe the lower battery voltage has largest output.
The strobe frequency is 15 Hz.



Sos

SOS%2014.4V
SOS%2010.8V

The sos mode is nearly unaffected by the battery voltage.


Conclusion

This driver does a good job of driving 3 leds from 3 or 4 LiIon batteries with good efficiency, but I am not impressed with the low voltage warning, it activates at to low a voltage and it does not shut down the light.
This means it is important to use protected batteries (Always a good idea with batteries in series).



Notes

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