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Old 02-11-2015, 07:19 PM #1
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Default SOLD: 4.2W NDB7A75 445nm handheld With G7

Another new 4W+ NDB7A75 laser with G7 mounted inside, I'll throw in a G2 lens if you want one.

Video:


LPM test Video (as you noticed, the power reduced after 60s because the protection kicks in:









The water proof 27cm x 24.5mm host is made from nickel-copper alloy (cost around $60 actually) for lowest thermal resistance to absorb and transfer the enormous heat from the copper heatsink and 7A75 diode to the whole body to achieve unlimited running time and stability that one cannot expect in such powerful laser.













The ACC 6A driver itself is developed specifically for high power blue laser with 5 modes: Safety Mode <30mw, half power <4W, Strobe, Full Power and SOS mode. Half press to switch modes.

Laser / Diode / battery Protections:

There's an electronic lock to prevent unauthorized use for multi modes driver. When starts, half press three times within three seconds and it will lock as safety mode(1~10mw), to unlock just half press five time within three seconds. For the diode, the laser will switch to half power if the total running time is over 2 minutes at full power, you can simply half press the tail button then it will back to full power. Driver will lowering down the current if the temperature is too high because of long operating. Reverse Polarity Protection is build in too.
[/SIZE]







The laser takes 2x18650 and the operating current is 4.2A with 3.2A drains from batteries.

Come with a G2 lens and mounted with G7 lens:

As usual - Beam shots:






Asking price: $320 with the new G7/G2, shipping is excluded.

Any questions would be welcomed!

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Old 02-12-2015, 05:45 AM #2
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

How are you getting 6W at 3.2A current? That seems wrong.

Beautiful build though!
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Old 02-12-2015, 05:55 AM #3
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Quote:
Originally Posted by rhd View Post
How are you getting 6W at 3.2A current? That seems wrong.

Beautiful build though!
It's batteries current, the real operation current is 4.2A though.

Thanks For pointing out!

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Old 02-12-2015, 05:57 AM #4
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Wow. Thats a sweet laser

I'm interested but I have questions.

0. How much does this weigh?

1. How do you switch modes? The video shows simple on/off.

2. What's the power output with a g7?

3. How are you shipping this?

4. Can I buy that 3x beam expander that you showed us a while ago with the laser?

5. Where can I buy one of these sanwu hosts?
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Old 02-12-2015, 07:10 AM #5
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

0. How much does this weigh?
620g without batteries.

1. How do you switch modes? The video shows simple on/off.
short press

2. What's the power output with a g7?
I would say near 5w in coherent lpm.

3. How are you shipping this?
Fedex probably with tracking.

4. Can I buy that 3x beam expander that you showed us a while ago with the laser?

Sorry you can't, I'd love to keep those for myself but "sawun" is considering to produce beam expander just like the one I built in the future.

5.Where can I buy one of these sanwu hosts?

Those host come with different sizes to fit 10440 16650 18650 for any diodes, some host even painted with pink gold too (surely with a higher price). Besides it may causes trouble for people to put in their own driver, not to mention they have to seal the bottom of the heatsink for the laser to function perfectly. May release within few months I guess.

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Old 02-12-2015, 10:16 AM #6
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

I also would like to purchase that host!
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Old 02-13-2015, 05:30 AM #7
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Any chance you could graph the output to show stability?

how/why must the driver be sealed? I sometimes like to take apart my lasers for fun, is that possible?

Also, is sanwu just a single shop laser business? And has it started selling yet? What products do they currently offer and do they sell internationally?

Thanks
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Old 02-13-2015, 06:13 AM #8
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Any chance you could graph the output to show stability?

LPM test would be a minute long as video format for your enquiries but it's hard to record as a graph, actually sanwu gaurantee one year warranty for all customers in chinese whether your diode toasted due to exceeding time of use in continuous mode or with no reason, it won't start. They trust the heat conducting abilities of the copper host and the heatsink together transfering the heat efficiently than most of the hosts for handheld laser.

how/why must the driver be sealed? I sometimes like to take apart my lasers for fun, is that possible?

Technically, it's a circle driver board needed to seal/glue at the bottom of the heatsink.

Also, is sanwu just a single shop laser business? And has it started selling yet? What products do they currently offer and do they sell internationally?

Nope, handheld lasers is just extra business for sanwu without much profits because the owner love lasers. Along with that, he designs and produce few lasers accessories upon my requests either from his mind. As for now, sanwu is planning to start sales internationally slowly, like now.

They make things that a laser enthusiast would love to have like beam expander. Furthermore, the owner decides to put a rgb inside the regular host and put fews up for sales to fans. . What a crazed man.

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Old 02-13-2015, 09:13 AM #9
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Here you go:

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Old 02-13-2015, 09:43 AM #10
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Watched the video. Where is the 6w stat derived from?
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Old 02-13-2015, 10:15 AM #11
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Quote:
Originally Posted by starlight View Post
Watched the video. Where is the 6w stat derived from?
That peak is from a fully charged high drain 3400 10a panasonic and I decide not to show it because not everyone have one and the battery is not included in this sales.

Battery used in the video is sanyo 2600mah if that could help.

My previous jetlasers 532nm sales experience told me not to put the best battery inside and show the best output.

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Old 02-13-2015, 12:27 PM #12
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Quote:
Originally Posted by Podo View Post
That peak is from a fully charged high draws 3400 10a panasonic and I decide not to show it because not everyone have one and the battery is not included in this sales.

Battery used in the video is sanyo 2600mah if that could help.

My previous jetlasers 532nm sales experience told me not to put the best battery inside and show the best output.
If this is using a proper constant current buck driver, and only requires 3.2A drain from the cells, something in your explanation doesn't make sense.

Are you saying that Sanyo 2600s aren't capable of a 1.25 C rate?
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Old 02-13-2015, 01:16 PM #13
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

I'm not saying sanyo incapable for this laser but two 10a 3400s would have a better, stable voltages when operating the laser in where sanyo 2600s show drop in voltages with 3.2a high input which affect the output with less than 300mw reduction. And a total 5% + - on LPM readings is normal usually. Not to mention it's a >5000mw laser.

Sanyo 2600 is definitely capable of 1.25c rate too.

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Old 02-13-2015, 02:59 PM #14
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Quote:
Originally Posted by Podo View Post
I'm not saying sanyo incapable for this laser but two 10a 3400s would have a better, stable voltages when operating the laser in where sanyo 2600s show drop in voltages with 3.2a high input which affect the output with less than 300mw reduction. And a total 5% + - on LPM readings is normal usually. Not to mention it's a >5000mw laser.

Sanyo 2600 is definitely capable of 1.25c rate too.
That's what doesn't add up. This is a buck driver, so you're using 2x input cells. This LD only drops 4.8 or 4.9 Volts at 4.2A of current. So even if fully charged Sanyo cells drop in voltage a bit when supplying 3.2A of current to the driver, that shouldn't have any impact on what the LD sees, because surely the Sanyos aren't going to drop from 4.2V down to under 2.5V under a 3.2A load... Even with some inefficiency of the driver factored in, the cells would have to sag a LOT before they should impact the ability of a buck driver to step down their nominal 7.4V to 4.9V at 4.2A output.

So something just doesn't make sense with your explanation that the use of Panasonic over Sanyo cells in a 2x cell buck driver config that only requires 3.2A of battery current has an impact on LPM results.
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Old 02-13-2015, 03:33 PM #15
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

I agree, it doesn't seem to add up for this laser, but for the Jetlaser I bought from him which uses only one 3.7 VDC cell, it would make a difference for its output whether I had a high MAH capacity cell or not, the Jetlasers likes to see 4.2 VDC for full output, but all of the batteries I tried sag down to 4.0 or lower pretty quick. He says he can get higher MAH capacity batteries there than we can here and thus why I saw a difference in performance from his test. I have a fix for that problem (with the Jetlaser), if anyone is interested PM me.

Thought I'd chime in that he indeed has a reason not to use his higher MAH capable battery in the test, I'm still trying to understand if this gentleman is perhaps being a bit optimistic with the ratings if the laser will do it under specific circumstances, maybe this is more of a cultural sales thing in HK to do that where here, we don't claim peak capability when the stars are aligned correctly in our own specifications?
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Old 02-13-2015, 04:04 PM #16
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Default Re: FS: 6W NDB7A75 445nm handheld With G2+G7 - the Sliver Star

Quote:
Originally Posted by Alaskan View Post
He says he can get higher MAH capacity batteries there than we can here and thus why I saw a difference in performance from his test.
Oh come on.... now that's going too far. Credibility gone, in my view.

We can get the latest Panasonic cells here, so is he really suggesting that the markets in Hong Kong have some magic cells for sale with better specs than Panasonic? (the market leader, and the choice of cell for Tesla).

Uh huh.....

Maybe he's going by what he reads on *****FIRE labels? If so, then he's right, they have access to 18650 cells that hold more energy than dark matter, never need to be recharged, and can supply enough current to power an aircraft carrier.
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CURRENT WAVELENGTHS:
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SAFETY & IMPORTANT READING (threads authored and contributed to by various members of LPF):
- Federal Aviation Administration - Laser Safety Initiative (link)
- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
- The Necessity of Safety Goggles (link)

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