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Old 05-29-2013, 02:32 AM #1
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Default Modifying a Crelant 7G2CS Driver - Advice?

Hello everybody,

I am currently collecting data and getting ready to modify my Crelant 7G2CS 600Lumen Flashlight into a powerful 9mm build.

Why do I want to do this to such a nice flashlight? You may ask. Well, the reason is in the modes. This flashlight has the following modes: High, Low, Strobe, and SOS. But it also has an infinite number of settings via a ramping feature. If you hold down the side button on it, it will slowly change the power up and down and you can stop at any point. So I could turn the power down on my laser if I wanted to.

So here is my question: I heard that the driver outputs 2500mA to the LED on high. As I am planning to run a 9mm on this driver, that is close but a bit too high I think. So how would I adjust this driver? How do I preserve the modes?

Thanks,
Isaac

Hopefully this will be a pretty awesome build. The host is quite durable so I think this will be an excellent project if I can make it work. I have already figured out taking the head apart, but not the pill yet. Hope I don't have to drill.


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Old 05-29-2013, 03:30 AM #2
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

Post hi-res pictures of the driver when you get it out so we might have an idea what you should replace to lower the current.
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Old 05-29-2013, 05:28 AM #3
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

remember that the LED in the flashlight has a lower forward voltage than the 9mm 445nm laser diode.

i don't think the driver will be able to boost the voltage and pump it with the 2500mA it drives the LED with.

put it on a test load with 3x1N5408 diodes as load and 1ohm resistor in series - and you can measure the current passing through them.
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Old 05-29-2013, 05:47 AM #4
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

I still have to figure out how to get the emitter disc off the top of the pill. I would rather not have to drill through.
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Old 05-29-2013, 08:32 PM #5
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

probably glued down with white fujik
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Old 05-29-2013, 09:46 PM #6
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

If you're talking about the white plastic LED centering disk, I'm pretty sure it's only held in there with a bit of pressure.

I had it just fall out on two of my lights, there were no signs of glue, epoxy/thermal paste.

Don't have any advice on how to remove it.
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Old 05-29-2013, 09:52 PM #7
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

Ill try something's today.. How bad would 2.5A be for a 9mm diode? I am worried that altering anything may ruin the modes
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Old 05-30-2013, 05:38 AM #8
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

Quote:
Originally Posted by wannaburnstuff View Post
Ill try something's today.. How bad would 2.5A be for a 9mm diode? I am worried that altering anything may ruin the modes
try it on a test load first and see what it reads
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Old 05-30-2013, 06:04 AM #9
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

Quote:
Originally Posted by wannaburnstuff View Post
Ill try something's today.. How bad would 2.5A be for a 9mm diode? I am worried that altering anything may ruin the modes
It is certainly pushing the diode to its limits. I have a personal unit set that high myself doing 3.4W but I assume and accept there will be a shorter life out of the diode. Heat management is also critical when running them that hard as there will be a lot of waste heat specially depending on efficiency. If it does 3.6W or something you will be better off than if it is only doing 3W.

Last edited by DTR; 05-30-2013 at 06:07 AM.
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Old 05-30-2013, 06:12 AM #10
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

Also note that the 2.5A may be an average value as some LED drivers have a bit of ripple on the output so the peak current may be much more than 2.5A.
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Old 05-30-2013, 06:24 AM #11
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Default Re: Modifying a Crelant 7G2CS Driver - Advice?

How short do you think it would make the diode life? At a certain point for the hobbyist it will not be noticed. I don't use my high power builds all that much.
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