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Old 06-10-2017, 03:15 PM #1
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Default Sanwu Laser

Referring specifically to these videos found on Youtube,
I ask you all members if it is a "False" or a "Truth"
To me for that little experience I have, I do not find there are 7.7W and 8.9W and 8+ laser diodes ... Will this really be a good seller this Sanwu?


sanwu laser lpm testing 7.7W445nm

https://www.youtube.com/watch?v=zKXJQK5Qj74


sanwu laser 8.9W445nm lpm testing

https://www.youtube.com/watch?v=3eUgdwRUzQM&t=5s

NUBM41 8W+445nmlaser destroy ceramics

https://www.youtube.com/watch?v=74aWVzIoKNY


Judge YOU ....!


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Old 06-10-2017, 03:38 PM #2
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Default Re: Sanwu Laser

Did you mean to say "You be the judge"?

Anyways, I would trust sanwu. They might've found over spec diodes. Or the power meter could be off.
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Old 06-10-2017, 03:46 PM #3
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Default Re: Sanwu Laser

Quote:
Originally Posted by Crazlaser View Post
Did you mean to say "You be the judge"?

Anyways, I would trust sanwu. They might've found over spec diodes. Or the power meter could be off.

I said: judge you what you see in the videos!
I'm not a judge! Mah strange that maybe such diodes exist!

And if the LPM is off then how does it measure power?
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Old 06-10-2017, 03:49 PM #4
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Default Re: Sanwu Laser

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Originally Posted by Crazlaser View Post
Did you mean to say "You be the judge"?

Anyways, I would trust sanwu. They might've found over spec diodes. Or the power meter could be off.
I would also,
but isn't the 8.9W a bit to close to the sensor for a true reading?
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Old 06-10-2017, 03:56 PM #5
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Default Re: Sanwu Laser

That's what I was thinking also Pete, I've always favored holding your laser much farther away than what is shown in the video.
IMO, the heat produced from the laser itself is going to affect the readings of the LPM.
I've had members tell me that it's not that big of a deal, but I wouldn't ever use it that close, especially with high output diodes.
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Old 06-10-2017, 03:56 PM #6
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Default Re: Sanwu Laser

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Originally Posted by GSS View Post
I would also,
but isn't the 8.9W a bit to close to the sensor for a true reading?


Boh! I do not know especially writing Nubm41, not a 7 or 8W diode does not exist! The Nichia that is what he thinks he invented did not put it on the market? The most powerful diode (to date) is only 6W + with a maximum peak at 7.2W but only push it!
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Old 06-10-2017, 03:59 PM #7
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Default Re: Sanwu Laser

Quote:
Originally Posted by BowtieGuy View Post
That's what I was thinking also Pete, I've always favored holding your laser much farther away than what is shown in the video.
IMO, the heat produced from the laser itself is going to affect the readings of the LPM.
I've had members tell me that it's not that big of a deal, but I wouldn't ever use it that close, especially with high output diodes.

What do you think of Bowtie? Experience you have to sell! With respect speaking of all the others! I consider them 3 Fake Videos! Especially the fact of ceramics! Even with my 5.5W I can split a piece of pottery pot
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Old 06-10-2017, 04:35 PM #8
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Default Re: Sanwu Laser

It will be intesting to see what Sanwu says about the discrepancy? I thinking there's a perfectly good explanation.

Maybe there just test videos of them pushing the diodes to the max. They probably won't sell them like that because they wouldn't hold up. But they might sell some like that if someone was will to take the chance.

I've bought off Sanwu quite a few times and have never been disappointed. Actually I just bought three more off them a couple of days ago.3 on their way.

I did ask them to push two of them harder than they normally would. So it will be interesting.
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Old 06-10-2017, 04:39 PM #9
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Default Re: Sanwu Laser

Quote:
Originally Posted by BobMc View Post
It will be intesting to see what Sanwu says about the discrepancy? I thinking there's a perfectly good explanation.

Maybe there just test videos of them pushing the diodes to the max. They probably won't sell them like that because they wouldn't hold up. But they might sell some like that if someone was will to take the chance.

I've bought off Sanwu quite a few times and have never been disappointed. Actually I just bought three more off them a couple of days ago.3 on their way.

I did ask them to push two of them harder than they normally would. So it will be interesting.

I wish Bob for you! Do you then confirm that there are 7.7 - 8 and 8.9W laser diodes? I'm sorry then you realize you've been cheated!
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Old 06-10-2017, 05:01 PM #10
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Default Re: Sanwu Laser

Quote:
Originally Posted by 3DLaSeRBuiLDeR View Post
I wish Bob for you! Do you then confirm that there are 7.7 - 8 and 8.9W laser diodes? I'm sorry then you realize you've been cheated!
I think there's been a communication breakdown. All I'm suggesting is "it will be interesting to see what Sanwu says about the discrepancy". Am curious myself, will be interesting to hear their side.
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Old 06-10-2017, 05:39 PM #11
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Default Re: Sanwu Laser

There will be freak diodes as well as the manufacturing process improving through the diodes manufacturing life, the trick is active cooling, without active cooling the power will bleed down as they heat up, 2nd best to active cooling is a large heat sink with a lot of surface area.

But yes, 8.9 watts in the video is possible, if he pre cooled the laser then that can also boost the initial power.

If someone used a freak diode in a heatsink pumped with chilled coolant we might see 10 watts, the diodes backing plate it's self in a bit of a bottleneck for heat when running past factory spec, can you believe they stick to a magnet...they do, so simple efficient cooling is not enough to find the limit, active cooling is the way to really push one although pre chilling if the video was made on a cold winter night could have boosted the diodes ability, but you did see it falling from the max.

I don't think sanwu is lying, I believe his results, he does have many diodes to pick a freak from, also even though I stick to 4.5 amps the 44 will typically output higher with a 5 amp driver, but it will bleed down faster so for 5 minute work I go with 4.5 amps and a heavy sink/reservoir.
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Old 06-10-2017, 06:10 PM #12
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Default Re: Sanwu Laser

Quote:
Originally Posted by BobMc View Post
It will be intesting to see what Sanwu says about the discrepancy? I thinking there's a perfectly good explanation.

Maybe there just test videos of them pushing the diodes to the max. They probably won't sell them like that because they wouldn't hold up. But they might sell some like that if someone was will to take the chance.

I've bought off Sanwu quite a few times and have never been disappointed. Actually I just bought three more off them a couple of days ago.3 on their way.

I did ask them to push two of them harder than they normally would. So it will be interesting.
On the subject of your "3 on the way" BobM, just why
but seriously the Spiker 1W has an unlimited duty cycle??
40mm copper sinking or not I don't see it..
Are we really just finding out sinking the driver's could be a reason?
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Old 06-10-2017, 06:29 PM #13
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Default Re: Sanwu Laser

As far as I'm aware the most powerful are still the NUBM44s. If you run them at 4.5 A, which is the highest recommended current, you'll get anywhere between 6.9 and 7.4 W. Of course if you push them harder + 5 A you'll get a little more out and depenging on the individual diode, you may get up to 7.8 W and possibly more if you're lucky. So Im guessing, if they really are getting these powers, that they are seriously over driving the diodes.

Having said that however, there hasn't been that much testing on these and I remember a similar situation with the original 9 mm 445s - the currents were slowly increased as we had more data. At the start, testing showed around 2.2 A to be the max recommended current. This increased later to 2.4 A and then Rick Trent started saying the were ok above 2.6 A! He always had some of the most powerful builds available and this was partly why!

Anyway maybe some of these diodes are capable of nearly nine watts, but I'd hate to think what current you'd need. If someone does choose to buy one please get it verified!
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Old 06-10-2017, 06:53 PM #14
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Default Re: Sanwu Laser

Quote:
Originally Posted by RedCowboy View Post
There will be freak diodes as well as the manufacturing process improving through the diodes manufacturing life, the trick is active cooling, without active cooling the power will bleed down as they heat up, 2nd best to active cooling is a large heat sink with a lot of surface area.

But yes, 8.9 watts in the video is possible, if he pre cooled the laser then that can also boost the initial power.

If someone used a freak diode in a heatsink pumped with chilled coolant we might see 10 watts, the diodes backing plate it's self in a bit of a bottleneck for heat when running past factory spec, can you believe they stick to a magnet...they do, so simple efficient cooling is not enough to find the limit, active cooling is the way to really push one although pre chilling if the video was made on a cold winter night could have boosted the diodes ability, but you did see it falling from the max.

I don't think sanwu is lying, I believe his results, he does have many diodes to pick a freak from, also even though I stick to 4.5 amps the 44 will typically output higher with a 5 amp driver, but it will bleed down faster so for 5 minute work I go with 4.5 amps and a heavy sink/reservoir.
Thanks Red for chiming in, that's makes sense.

But to the other question posed by 3D, how far should the diode be away from the Thermopile? I've often wonder that myself. Is there a set standard?

Quote:
Originally Posted by GSS View Post
On the subject of your "3 on the way" BobM, just why
but seriously the Spiker 1W has an unlimited duty cycle??
40mm copper sinking or not I don't see it..
Are we really just finding out sinking the driver's could be a reason?
As per their website the Spiker is suppose to have a unlimited duty cycle.

"And thanks its huge capacity, spiker achieves unlimited duty cycle until running out of battery"

The only Spiker that isn't listed as unlimited is the Spiker 7 watt .

But on to the more important question of "why, " , that is a question that has perplexed the learned man ,mystics and shrinks for ages. I being a small fish in a big sea have to plagiarize what another members wisdom brought forth, when he said " I just gotta see".
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Old 06-10-2017, 11:34 PM #15
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Default Re: Sanwu Laser

Lets be honest guys! All sellers make inflated claims on the lasers they sell. Its been that way for years! This should come to no surprise to anyone who has been into laser pointers for some time!
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Old 06-11-2017, 08:55 AM #16
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Default Re: Sanwu Laser

In fact Bob is curious too! Let me know what they answer you

Beautiful explanation Bob ... exhaustive! Anyway I think that honest things are always the best thing, especially when you spend money!

Maybe ... GSS

Well said Grainde! seeing is believing!

I ask him as a profane! Jordan puts the lasers I think but I'm not sure about 10cm from the LPM will this be the right distance?
For a continuous cycle concept I always say that I can only speak of referring to DC-powered and 5V-powered laser modules, that is a continuous cycle so much so that they are used for hours and hours!

I do not share what you say Vetttech, take DTR for example, I've known him for years, and you have never lied to ever written or said things not true! I recently visited her google site, and the only novelty in diode factors were those from 1W 4.5W and so at the bottom of the page! In your opinion if there were really 7w, 8w, 8.9w, 9w diodes Jordan would not put them on sale? I bet that if you tell Nichia this thing as a minion we laugh in the face!
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