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Old 06-08-2012, 08:31 PM #1
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Default Why is this happening?

I am building a 2w m140 laser, but I wanted a high and low power mode so I attached one 500ma driver and a 1.8ma driver, however when I change between them they are exactly the same brightness. Does anyone know why that is happening?

I am using 2 14500 batteries to power it. I tried it with two 18650s too but I still get the same results. Do I have to use 3?


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Old 06-08-2012, 08:32 PM #2
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Default Re: Why is this happening?

What is the driver ?
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Old 06-08-2012, 08:56 PM #3
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Default Re: Why is this happening?

Mohgasm 1.8A linear driver circuit [MOH1.8] - $14.99 : Cajunlasers Store

JIB Driver 500mA linear microdrive [JIB500] - $11.99 : Cajunlasers Store
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Old 06-08-2012, 09:10 PM #4
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Default Re: Why is this happening?

I don't suppose you've tried measuring the power, or even the current? Your eyes aren't subjective or quantitative.
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Old 06-08-2012, 09:22 PM #5
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Default Re: Why is this happening?

I measured the power out of the drivers with a multimeter, 1.75a for the 1.8 one, and .481 for the 500, I tried looking at it with laser glasses too, but it still looks exactly the same. Two 15400 batteries should be enough power right?
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Old 06-08-2012, 10:53 PM #6
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Default Re: Why is this happening?

If they're outputting the right current, then all is well. You just might not be able to perceive the difference in brightnesses.
You need to get a hold of an LPM to make sure.

Last edited by AutoItKing; 06-08-2012 at 11:02 PM.
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Old 06-08-2012, 11:38 PM #7
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Default Re: Why is this happening?

How did you wire up the two drivers? Make sure they're never both on at the same time!
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Old 06-09-2012, 12:57 AM #8
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Default Re: Why is this happening?

My main questions:

- Schematics of driver wiring
- How do you switch driver

If that all correct and succesfully tested the outputs on a test load get youreself an lpm reading!

Greetings,,
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Old 06-09-2012, 09:22 PM #9
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Default Re: Why is this happening?

There should be a perceivable difference in brightness at those current levels IMHO. Plus there is a shift toward a longer wavelength as the current increases and the diode heats up, which would increase visibility.
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