What's The Concensus On Driving An M140 445nm At 1.8A?

GAtkins · Feb 18, 2012

Yeah or ney? I read most of the stuff I could find and I have three of them running at 1.62A, but without much time on them. One of them LPM's at 1.95W peak, haven't yet metered the other two. Need to juice the batteries and see if I can get that one above 2.0W.

Considering pushing one to 1.8A. Anybody doing this with success and longevity?

Thanks.

Glenn

Lase · Feb 18, 2012

DTR recommends 1.8A max from what I've seen. I'd trust him on that. :beer:

Lase

GAtkins · Feb 18, 2012

It would be his diode that I would push that hard.

Thanks.

Glenn

Sigurthr · Feb 18, 2012

Remember that 1.8A is >8.1W (>~6W after useful energy removed), so plan accordingly when considering heatsinking and/or active cooling. 6J/sec of heat is no joke!

GAtkins · Feb 18, 2012

Would a copper diode and a copper sink be enough for decent duty cycles?

Thanks.

Glenn

Deleted member 22482 · Feb 18, 2012

GAtkins said:
Would a copper diode and a copper sink be enough for decent duty cycles?

Thanks.

Glenn

I had a normal laser earlier running at 1.8A, with an ordinary heatsink (aluminium) and the duty cycle on it was 25 secs on, 40 secs off. Don't know if that helps a lot but yeah

Ghostchrome · Feb 18, 2012

I run an M140 at 1.8A in a C6 with an aluminum heatsink. Runs like a champ, but it does get warm. Definitely have to use a duty cycle.

Garoq · Feb 20, 2012

Yes.

I recommend a copper module and/or heat sink for the longest duty cycle, in our case 1 minute on, 2 minutes off.

I have not seen any long term failures yet. It appears that if the diode can't take the current, it will fail pretty quickly.

jakeGT · Feb 20, 2012

If your diode can't take the heat, you will know.

It'll degrade after weeks of use, if it starts degrading turn the current down

Blord · Feb 20, 2012

Did you metered the other two 445nm diodes in the meantime ?

GAtkins · Feb 20, 2012

Not yet, but I will when I get a chance.

Glenn

j0sh · Feb 21, 2012

Is it safe to say that 1.62 is good? Is there really anyway to tell without having a LPM?

Garoq · Feb 21, 2012

j0sh said:
Is it safe to say that 1.62 is good? Is there really anyway to tell without having a LPM?

Most, but not all of the 445nm diodes can take 1.62A. There are no guarantees.

What's The Concensus On Driving An M140 445nm At 1.8A?

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