120mW 638nm for $10.99 on the ebay including other Powers. :eek:

It's interesting that they would have sources for both 100mW devices and 120mW devices... you would think that if they are the same device, they would rate them all higher so they could charge more....

Sorry, maybe I'm missing something here, but instead of taking all these photos of the diodes sitting doing nothing, why not hook it up and look at the color? It takes 30 seconds to visually verify whether these are boring 660s or not.

Calm down dude. I like taking photos. Iam setting up right now.

Anyone know anything about products like these?

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Since im sure these devices require that the laser be very defocused 120-500mW would not be too much. And red doesnt absorb well into skin so it would be a good choice for such a device.

Are we there yet?
Are we there yet?

Jk. Cool find. I'll be looking forward to the results.

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Helios said:

Anyone know anything about products like these?

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Since im sure these devices require that the laser be very defocused 120-500mW would not be too much. And red doesnt absorb well into skin so it would be a good choice for such a device.

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I can tell you that it can easily permanently damage hair follicles, changing levels of keratin and possible altering the sebaceous glands if that helps.

Fenzir said:

Interesting that that shows 561 and 638, two colors that seem newish around here.

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Neither 561 nor 638 are in any way new. 561 has been around awhile. However it wasn't until recently that CNI has been convinced to start attempting to make 'portables' in this, and other, exotic wavelengths. Lab lasers have been available for a while.

Same with 638nm diodes. They've been around a long time, they just haven't been 'affordable' (if these are actually decent 638's anyway) until recently.

The 100mW diode is doing ~46mW at ~100mA.

Diode has the same pin out as a LPC-815

Color Does not look anywhere near 635nm but closer to an LPC-815 diode.

I dont know how red 638nm should be but i see a trace of orange but for sure nothing close to my 20mW 635nm diode.

I think well at least this 100mW is a 660nm diode.

Iam going to test the other one out too. Hold on.


Its not looking good so far.

Fenzir said:

I can tell you that it can easily permanently damage hair follicles, changing levels of keratin and possible altering the sebaceous glands if that helps.

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Well thats the point isnt it? I am no medical professional but I know these are made to damage follicles to prevent hair growth. I know that they have been commonly made using IR. Red should work near as well (maybe even better? targeting dark follicles and hair while leaving skin mostly just warmed) and being visible makes it less dangerous. The amount of power desnity needed for this is pretty high. So they would need either a focused lower power red (would take forever since it only treats a pinpoint at a time) or a defocused array of very high power reds that could treat a larger area.

These home units NEED to be cheap (teens dont have $300 laying around for a personal grooming item) and are fairly simple with the laser being the only real item of expense. This would explain why these are so cheap. Maybe the unit costs $200 or less and has an array in it. Think the projectors have 24 1W diodes in them AND a lot of other expensive pieces and still only cost $800. 12 or so 500mW diodes with no other expensive parts could come in around $200 or less especially since they may be more popular sellers than a video projector.


***just random speculation of course ^^^


EDIT: I find its hard to discern 635nm from 658nm. It might be better to try and compare the relative brightness. If you could get it to the same power as your 658nm laser and then compare the dots or beams in fog that could be more useful I would think.

Not surprised. I expected typo'd 658nm diodes. To the eye, 638 should look identical to 635. Nowhere near 660.

Tested the 120mW one.

at 130mA the diode was doing 51mW steady.

Same think. Nothing close to 635nm.

In conclusion these are not 638nm diodes.

I new this was More of a possibility and is why i was saying to hold off until someone tests them.

O well Going to put an Update in the OP.

Edit: Also sent a message to the ebay seller.

I might send one over to Cyparagon to confirm this. But its pretty clear that these look like 658nm but dimmer.

lazeerer said:

Tested the 120mW one.

at 130mA the diode was doing 51mW steady.

Same think. Nothing close to 635nm.

In conclusion these are not 638nm diodes.

I new this was More of a possibility and is why i was saying to hold off until someone tests them.

O well Going to put an Update in the OP.

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Your certain? They are harvested and seem like new diodes we have not seen before. Seems odd they would even bother harvesting 120mW diodes when you can get 150 or even 300mW ones so cheaply. I guess their intent could have just been to fool a few people but that doesnt seem like a wise long term strategy.

Yes iam sure. I can tell the difference between 635nm and 660nm.

The diodes are 658nm. There is No way these are 638nm. If they where at 50mW they would be brighter then my 20mW 635nm. Which they clearly are not.

Plus the color is not anywhere close to 635nm. Its the same as 658nm but dimmer.

Edit:

I will take some pictures.

If they look like 660 but are more 'dim' compared to a 660 at the same power, then they could be a higher wavelength.. like 685nm.

lazeerer said:

Yes iam sure. I can tell the difference between 635nm and 660nm.

The diodes are 658nm. There is No way these are 638nm. If they where at 50mW they would be brighter then my 20mW 635nm. Which they clearly are not.

Plus the color is not anywhere close to 635nm. Its the same as 658nm but dimmer.

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Bummer. Hopefully the 500mW diodes are 638 or atleast can drive to 500mW...but im not holding my breath.:cryyy:


Are you still going to send them to Cyparagon to try and figure out what exactly they are?

Fenzir said:

looks like a LD to me.

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Fenzir said:

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This is the first interesting thread with data on LPF in a while. Would you mind not spamming it with useless shit like this? Thanks.

benmwv said:

Are you going to leave the glass thing on it?

Having any extra lens for the light to pass through will decrease output, but it may have some function that I cant tell from the pics.

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Might be beam correction optics.

Also, I'm sending him an email asking to cancel the order.