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ArcticMyst Security by Avery

Why is this happening?

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Newb

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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?
 





Cyparagon

Cyparagon

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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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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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AutoItKing

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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:
Sigurthr

Sigurthr

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How did you wire up the two drivers? Make sure they're never both on at the same time!
 
offroadfreak8582

offroadfreak8582

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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,,
 
Garoq

Garoq

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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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