Why is this happening?

[Newb]

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?

 

[Blord]

What is the driver ?

 

[Newb]

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

JIB Driver 500mA linear microdrive [JIB500] - $11.99 : Cajunlasers Store

 

[Cyparagon]

I don't suppose you've tried measuring the power, or even the current? Your eyes aren't subjective or quantitative.

 

[Newb]

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?

 

[AutoItKing]

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.

 

[Sigurthr]

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

 

[offroadfreak8582]

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]

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.