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Old 12-20-2014, 07:50 PM #1
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Default 405nm diode dying?

Hi!

This is the run of the mill ebay 405nm AAA powered "Chinese" unit

I took the module and board out to check, everything looks fine, lens has no smudges. After first 3 days of use I left it alone in working order. Then I come back and it the dot is quite dim, not a focused beam like before. I've cleaned the lens, tried adjusting it and fresh batteries, still dim.

When I was first fooling around with it I shot it at some phosphorescent paint both on a substrate and in the bottle, it does not appear to be exciting the paint nearly as much as previously (as an objective "semi scientific" method to eliminate the possibility that my eyes just adjusted to the brightness or something.

The other new green model I also purchased has perfect visible beam in dim light, the purple did previously albeit more subtle...

The dot appears to be about the diameter of a pinky fingernail from 1-2 feet away with a dark spot in the middle. Focusing changes on the lens make no difference in overall brightness either, just diffuse it more.



Last edited by nibbles; 12-20-2014 at 07:51 PM.
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Old 12-20-2014, 08:03 PM #2
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Default Re: 405nm diode dying?

Be sure it's not the batteries. Other than that all I can say is its cheap Chinese crap! They have zero quality control on those, sometimes they arrive DOA and sometimes last a few days or you may get lucky and have it last for years.

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Old 12-30-2014, 10:24 AM #3
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Default Re: 405nm diode dying?

I think i have the same problem on my green one. Check my thread.
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