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Channel: Laser Pointers

Which laser color is the brightest at night ?

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sorry if i asked a stupid question. when i saw the first laser pointer at DX i was shocked it was 5 mw and green of course. After there was red and blue and so on. Now there are so many types. Now i am thinking about buying one around 200 dolars, which one do you advice ?

Thanks and regards !

Direct driving nubm44 with 1 or 2 18650 ?

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I know you can direct drive a nubm44 with 1 18650. will it work with 2 in series ?

Anyone buy from Laserpoints.com?

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I wanted to get the waterproof 505 nm reviewed by LED_museum.
I can't find it anywhere on EBAY-although there are many offerings of the 488 nm version.
I only found it at the "Laserpoints.com" store.
Any experience with them?

Thanks!

My Laser In The Classroom

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I haven't posted for a long while, but I've still been playing with lasers. I teach Electronics classes at the local Jr. College. For the last few years it's been frustrating because I couldn't show my lasers to anyone because I didn't have enough safety glasses. Well, that all changed when the person in charge of grant money allowed me to purchase enough Eagle Safety Glasses for all the students.

I always start with my 100mW Green Laser by lighting matches and popping balloons. Being that we are in an electronics class, I also show them the driver circuit and explain how it works.

My new laser is the 1.7W Blue Laser that's a lot more impressive. Here's the video of the first test:

https://vimeo.com/283230859


Bob Diaz

vid shot with quadcopter

Indoor Galactic Scenery

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Happy Saturday!! A mix of photos below - I experimented with a very inexpensive diffraction grating from LaserLands (link) in a handful of them. Also added in some LUMIA. In the pics where you can see the wall, I could picture a type of 'lunar landscape' ...at least if you use your imagination, lol.

FYI on this particular 4-in-1 grating - this is a small circular wheel with 4 patters on it - each taking up 1/4 of the area. So, its only meant to be used 1 at a time unless you tried to cut it up - I wouldn't recommend that - but they are cheap enough you could try, I suppose.

The last couple pics in the 1st set are using a 'green' PBC, however I was using a 490nm beam, so of course it wasn't ideal, but I don't mind :D.

There are more on Flickr, if you are interested.

IMAG6127 by Lewie Wilkinson, on Flickr

videotogif_2018.09.08_13.19.46 by Lewie Wilkinson, on Flickr

IMAG6132 by Lewie Wilkinson, on Flickr

IMAG6139 by Lewie Wilkinson, on Flickr

videotogif_2018.09.08_13.15.19 by Lewie Wilkinson, on Flickr

IMAG6149 by Lewie Wilkinson, on Flickr

IMAG6164 by Lewie Wilkinson, on Flickr

IMAG6170 by Lewie Wilkinson, on Flickr


IMAG6159 by Lewie Wilkinson, on Flickr

IMAG6134 by Lewie Wilkinson, on Flickr

videotogif_2018.09.08_13.11.26 by Lewie Wilkinson, on Flickr

IMAG6098 by Lewie Wilkinson, on Flickr

IMAG6094 by Lewie Wilkinson, on Flickr

IMAG6091 by Lewie Wilkinson, on Flickr


And a few more using more of the right-angle prisms and the odd piece that is "coffin" shaped (link).

IMAG6028 by Lewie Wilkinson, on Flickr

IMAG6033 by Lewie Wilkinson, on Flickr

IMAG6034 by Lewie Wilkinson, on Flickr

IMAG6042 by Lewie Wilkinson, on Flickr

IMAG6066 by Lewie Wilkinson, on Flickr

IMAG6069 by Lewie Wilkinson, on Flickr

laser engravers

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Tried looking around to see if anyone is using their lasers with a cad chassis. Built a laser a couple years back from info found here, but haven't really done much with it. But with a practical application that doesn't risk getting me in trouble looking to dig back into it.

Is this the tool for changing lenses?

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Hi
I just want to confirm thhttps://www.ebay.com/itm/Spanner-Wrench-1-32-Great-Tool-for-Lens/201921608990?hash=item2f03773d1e:g:K1QAAMXQMXRQ8y5 x

Review of 2 Hosts with Corrective Optics

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I'm a little overdue on sharing a review of a couple of hosts I have purchased from fellow LPF members. Oddly enough, I wish I had more beamshots, but once the rain clears out of the US mid-west, I'll try to get some that do justice.

The 1st host is the 'lpf-member designed host slow axis correction' (here is the link, looks like it moved to the veterans section and there I cannot confirm its the right link:
https://laserpointerforums.com/f42/l...103080-18.html)

I saw the project and reached out to trinh hong phuoc to see if he'd make me one. Communication was great, everything went as planned, got pics of the host before it shipped - and the rest is history. Would absolutely deal with trinh again.

Some pics:

Very well packed!
IMAG5438 by Lewie Wilkinson, on Flickr

IMAG5440 by Lewie Wilkinson, on Flickr

Pre-wired, just needed a 20mm module - which Lifetime (Rich) made me an adapter for a 12mm module - and we were throwing light!

IMAG5441 by Lewie Wilkinson, on Flickr

This is very well put together, and has a rear latching switch, and a side latching switch w/led indicator. Takes 2 18650s. I got a pair of 6x cylindrical lenses from OPT lasers (poland - LINK). What wasn't great is that I ordered the pair WITH a brass mount, and was only shipped the lenses. OPT was quick to get the mount in the mail for me, but that was a bunch of waiting that wasn't expected.

I don't have much patience :) So I put these on wood temporarily:

IMAG5526 by Lewie Wilkinson, on Flickr

IMAG5528 by Lewie Wilkinson, on Flickr

Finally, I took the time to mount them on the brass:
IMAG5956 by Lewie Wilkinson, on Flickr

I do have a Sanwu 3.3x expander - but I honestly like this host just using the 6x corrective optics alone. It certainly looks awesome either way!

The 6x optics are def awesome when paid with an m44. I really enjoy this laser, I'm super thankful for the folks that put their brainpower and time into making this.

(GET SOME BEAM SHOTS..)


The 2nd host is is from badboybilly, and is made for corrective optics. Again - super easy to deal with - good communication and transaction went through without a hitch. Also, well packed, but I'm not sure where the photos went. (Side note - its really cool to get newspaper from another hemisphere as packing material!!) This host is made for 2x 18350s. This is the 1st piece of hardware I've acquired from BBB, and I was stoked from the moment I saw it posted. Originally, I was going to use it for a NGD7475, as I have several NUBM01s, but wanted a 7475. At the same time, I've been wanting a high-output RED hand-held, and my 7475 still hasn't been delivered, so I took that as a sign to transplant the USHIO HL63283HD 638nm. You might have seen my "low budget corrective optics" post a while back which resulted in this...

IMAG4997 by Lewie Wilkinson, on Flickr

a PVC cavity shoved onto the end of a C6 host. It worked. But now I had this legit hardware.

Get to work:

Another host with a rear latching switch. This host's side switch is not latching, just momentary (fine by me).

IMAG5992 by Lewie Wilkinson, on Flickr

Was not pre-wired, so that's pretty much step 1:

IMAG5990 by Lewie Wilkinson, on Flickr

This, too, was ready for a 20mm module - so I got my 1st 20mm from DTR and I'm using a Astralist Driver set to 1.5A:

IMAG5996 by Lewie Wilkinson, on Flickr

With everything together - the laser module / optics cavity portion would not fit all the way into the host:

2018-09-08_11-35-15 by Lewie Wilkinson, on Flickr

All the prices 'float' (very fine tolerances, but are not locked down) within the main cavity...so, I could do one of a few things to gain some space - starting with cutting down some of the tail-cap spring, but its a nice spring :) . Also, not wanting to try to remove the rear switch as the battery tube/switch is all put together very nicely to be 1 solid piece. I could use shorter batteries, but it probably still would not have bought me much room, annd I did not want to use smaller cells. So, I went for shortening the 20mm module. I am not going to go into all the painful and stupid things I did, as I think I ended up harming this WAY TOO EXPENSIVE diode in the process, but I got it shortened up and now everything is nearly flush!

Putting the lenses down into the cavity was a chore - I used electrical tape wrapped tweezers to place/adjust them, and UV glue to set them.


Without the cylindrical pair - at 28.5 feet - G2 lens: ~7"
2018-09-03_04-38-10 by Lewie Wilkinson, on Flickr

With cylindrical pair (2x from eekbay) - at 28.5 feet - ~3"
2018-09-03_04-39-07 by Lewie Wilkinson, on Flickr

This doide certainly needs more than 2x lenses. IMO, this diode is not worth the amount I paid for it, when you can get over a watt with a $20 diode, and the divergence is crazy.

This is a super nice host, and I'll likely be using it for the 7475 in the end :) . We shall see.

Sorry for lack of beamshots, and overall length of post. I hope to update this soon.

Of course, huge thanks to trinh and badboybilly!!!

What a cheap laser can do, Beware!

Need 405 options

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Sanwu and JL both have big boy 405 lasers. The Sanwu is a 1.6w and costs $US240 while the JL is 800mw and is $US299. I have a Striker 7.5w and a PL-E. Both are what I consider high quality products.


That being said I am open to other options. Can you guys weigh in on pros and cons of these two lasers and if you have other suggestions post them as well.

490 nm Lightsaber ;-)

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Just for fun. My Sanwu Challenger 2 (sharp 490 nm) pointed into an Ultrasabers light saber blade.
Not attached -just pointing in. With a ring adapter and a set screw it could be attached.
What would be better would be to take a replica LED lightsaber-with motion sensing and sound-and swap out the LED with a laser diode. Although with the bright LED's available these days it might not make sense.
My 1 watt 520 was just too bright for easy photog.

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What's a reliable source for 18650 batteries that ships to EU?

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LiIonWholesale only ships to North America, unless the orders are for 500 or more batteries. I'm in the EU. What is a reliable site to buy the correct number (how many?) of 18650 batteries to power a NUBM44 diode?
I've seen these batteries on Amazon (UK) but I don't know if I can trust that they aren't fake.

Test of diodes in NUBM08 block all at once

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This is the follow up of the story about NUBM08 block from taobao.

When I finally received the PCBs I tried to solder one of them to the block. Was not easy with my old soldering set of little precision, but finally got it. Not all perfect but OK.

I had a compact Cu HS for P4 and purchased a little more of stuff for this project like 15A rated 12V power supply, Thorlabs adjustable lens holder and 60mm cage rods - here you see the final construction.
The spot pictures are from 29V, 1A (all LDs are connected in series) at 1m and 32V, 2A at 5m. Too much light makes my handy cam not be able to focus well.

The highest current I could get up to now with this power supply-DC booster combination was 3.3A at 34V, I think that I need to buy a 24V power supply to make the input current into booster less than 10A limit.

Anyway maybe no need to exceed the recommended by Nichia maximum of 3.5A... especially with such a small heatsink...

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685nm and 690nm laser diodes

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I have been looking for some interesting red wavelengths to add to my collection.
685nm diodes can be found on eBay at ~15mW but I would like more power than that.
During my search, I stumbled upon these:
685nm 50mW
690nm 35mW

Just thought I'd share in case anyone else is interested.
I may try the 50mW 685.

Here is a link to a datasheet for a 55mW 685 from Ushio:
https://www.ushio-optosemi.com/docum...750MG_Rev0.pdf
And another from opnext with the same product code:
https://www.digchip.com/datasheets/p...6750MG-pdf.php

Guide: Where to buy 18650 & 26650 Li-Ion batteries

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This same question seems to pop up once in a while,
so I added a sticky for: Where to buy 18650 & 26650 Li-Ion batteries

Also if guys in "Down under" could tip us of best place in AUS to buy Li-Ions that would be great!


North America:
Liion Wholesale Batteries
Phoenixville, PA

IMR Batteries
Houston, Tx

Illumination Supply
San Jose, Ca

Mountain Electronics
Salt Lake City, Utah


EU:
AkkuTeile.de
Nilkheim, Aschaffenburg, Germany



Battery Charger tests & reviews:
Comprehensive tests of various battery charges @
Lygate-info >>


Battery tests by type:
16340, 16350, CR2 etc >>
18650 Battery tests >>
26650 Battery tests >>
CR123A and rechargeable substitutes >>

PGL-III-C Rebuild 490 SOLD!

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I’ve had this host nearly a year sitting in the draw finally was inspired to rebuild it, well actually it was never a build host it was sent empty with the 589 module
I bought from DL.

I went with another 490 Sharp diode and Flexdrive set at 300ma.

For the housing led I had a 3led RGB board lying around and decided to use that
A bit of overkill but seems to work well and it can be changed to 7 colours with the click of a switch combination inside the head, the cyan I chose is close to the diode.

This time I managed to take plenty pics hope you all enjoy!

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Looking for a host

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I've not been here for a while and nt built one for a while either, just wnted a cheap simple host that I've used before but can't seem to source one, can anyone help ??

Attachment 61482

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WTB 575nm Labbie

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I 'bought' a yellow laser from OPT (CN), and never got it. So, I have some money to put towards another one. Hopefully someone has an 'extra' and is willing to part with it.

I would consider a higher wavelength pen (dragon, etc), but ideally looking to not spend a fortune - but when the pickins are slim...

So ideally, a 575nm. But if its yellowish, I'm interested.

Thanks :thanks:

Alternatives to DTR for NUBM44 modules?

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I emailed DTR on September 9 for information about the purchase of a NUBM44 module, and he hasn't answered yet. His last post here is dated September 5, and his last visitor message, dated June 12, ends with " when ever you can get back to me that would be great!"

DTR has (or... had?) a great way of selling laser modules: not just bare diodes, but assembled modules comprising a heatsink, lens and driver as well, with the option to customize all components. Is there any other reliable seller who does that?

Pen host 505nm

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This thread isn't sell

- its use driver boost from me
- it is SHarp diode 35mW , i set at 160mA
- power ~50mW
- duty cycle: 30s
- battery: 1 x 10440
--------------









:beer: thanks for watching!

Laser Genetics NS300 Green Laser Sub-Zero Designator w/Scope Mount $49.99+$10s&h

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Occasionally we get people asking for a laser that works in low temperatures, or for signalling in emergency situations. I think this one fits that role perfectly.

If you are a DVOR member, there is s screaming deal right now on the $49.99 Laser Genetics NS300 Green Laser Sub-Zero Designator w/Scope Mount

DVOR has a flat $10 shipping rate for your entire order.


here is the obligatory cut and paste:
Color: Black
Weather Resistance: Yes
Length: 5.75 in
Package Type: Box
Finish: Matte
Fabric/Material: Aluminum
Beam Color: Green
Battery Type: CR123A
Weight: 6 oz
Wavelength: 520 nm
Maximum Range: 300 yds
Power: 3.5 mW
Attachment/Mount Type: Scope Mount
Battery Life: up to 7 hours in 0 degree temperatures
Product Weight: 4.95 oz
Color: Black

  • Allows wildlife and hunting observation at long distance.
  • Laser beam is visible for up to 3 miles, providing pinpoint rescue location.
  • Beam diameter is easily adjusted to be a light source for night hiking.
  • Precision machined from high tech aluminum.
  • Black matte anodized finish.
  • Fully O-Ring sealed for dust and water resistance.
  • Fully multi-coated optical lens system.
  • Nitrogen charged for anti-fog.
  • 1-inch tube adapts to many mounting systems.
  • Rotary optical beam collimator allows quick adjustment of beam diameter and intensity.
  • Green laser light frequency is easiest light for the human eye to see.
  • Amplified coherent light - most efficient light for long distance illumination.
  • Operates in sub-zero temperatures.
  • Tail cap switch for easy activation.
  • 1 Year Warranty

Why is this sanwulaser so cheap?

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Hi all,

I'm just looking to buy a good laser and most on here recommends sanwulaser.com

I'm looking for a green laser 532nm 50 - 150mw

So I came across this laser:

https://www.sanwulasers.com/product/304

I think it's a good one but the price seems to be very cheap at $15 compared to other lasers around with similar specs...

So my question is guys...Why??

Thanks.
D.

SanWu 1 watt 520 nm Multimode-18650 Protected-too long-resolution

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A great product indeed! Working nicely.
This is really a heads up for anyone having issues with switching modes on the Challenger 2. Luckily SanWu has excellent Customer service.
Thanks Francis!

Li ion batteries- no prior exposure.
I learned that the Lithium ion batteries are named by diameter and length- with the second set of numbers being the length in millimeters. So an
18650 is 18 mm in diameter and 650 mm long.

Except when they are not!

First the are 18650' that are protected-and are longer than standard 18650 *while still being labeled as 18650.*
But not only that- but there are variations in the length of different brands of Protected 18650 batteries.
That last is relevant because although I bought high quality Nitecore Protected 18650 batteries-I had odd issues with my Challenger II not igniting all the time-and the multimode switching was not working. Slightly unscrewing the tailcap/switch helped.

Francis at SanWu gave me a link to Orbitronic and I bought some of their version of the protected 18650. Now I can switch from 1mW, to half and full power!
The Nitecore Protected 18650 was a few mm longer than the Orbitronic Protected 18650 which pushed in the power switch slightly when the tail cap was fully tightened. This disables the switching of modes since it requires pulsed off/on sequences

I'm guessing that there is no exact length standard because common devices use a spring which can adjust for variation in length.

Desired Specification for a new Driver?

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Hi all - I started drafting a specification for a new driver last night but I came to the realisation that since I'm extremely new to Lasers and the LPF - I have absolutely no idea what people would actually want :)

So this is a "feature request" thread. What things from existing drivers are essential features, what other features would people like. I want to design something that's actually useful. Even if it's a redesign of something that's out there but generally unavailable, or something that's using obsolete components I'd happily dip my toes in.

If I end up designing something that people actually want to use I'll make up some panels of them and see if I can get a good price for PCBs and assembly of a small batch to send round to people for evaluation.

Things I'm specifically looking for guidance on:
  • Dimensions & mounting holes etc. (Circular/rectangular?)
  • Input & Output voltage range (Buck or Boost? Buck-boost?)
  • Protection (reverse polarity, undervoltage, thermal, any others?)
  • Kit form or assembled & tested?

How many beams from a 1000 line/mm grating? FREE gratings to the first 6 posters*

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It has been insisted to me by one person in particular that a 1000 line/mm grating will produce 6 beams. The math says a 1000 line/mm grating will produce 3 beams above 500nm, and 5 beams below 500nm. My testing agrees. I provided photographic evidence of a green laser producing 3 beams, but I was called a liar and told I was doctoring and misrepresenting photographs. I don't like being called a liar. So I'm taking the scientific approach: peer-review.

I'll give 4 free gratings each to the first 6 people. Here's how this will work:
1) You must have 100 posts or more (for integrity reasons) and be in the US (for shipping reasons).
2) post in this thread to claim a spot.
3) once 6 people have been selected and confirmed, each will purchase https://www.ebay.com/itm/292403982201
4) PM me a screenshot of the receipt (with personal info blacked out as you see fit) and a PP address.
5) I will deposit $6 as reimbursement.
6) when your gratings arrive, perform tests with various colors and post your results and photographs here. If it is indeed 6 beams and not 3 (or sometimes 5), I want to know, because you may be entitled to a Nobel prize in physics for such a discovery.

7*) if you already have a 1000 line/mm grating and would like to participate, please do! Hell, I'll throw in $3 to the PP of your choice for your trouble if you want.


Edit: List of confirmed claimants:
Gazen

What's new

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Who are the sellers of drivers nowadays, after one for a Mitsubishi ML101U29-25 and how far can you push it safely ?

some "new" pics 9/15/18

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These pics were taken the end of July using my LK-PD2 projector (DMX controlled) and various colors of hand helds. I used one glass sphere, two- 1/2 glass spheres, hematite balls and some different mirror set ups. In many of them a 488nm is used behind the glass sphere. There are also some pics with only hand helds. After checking them out in detail weeks later, some of them may have a bit too much going on in them , but I think the ones with only one of two colors are the nicest (at least to me). Enjoy


DSC_5721_resize by brucemir, on Flickr



DSC_5730_resize by brucemir, on Flickr



DSC_5732_resize by brucemir, on Flickr



DSC_5747_resize by brucemir, on Flickr



DSC_5753_resize by brucemir, on Flickr


DSC_5756_resize by brucemir, on Flickr



DSC_5758_resize by brucemir, on Flickr



DSC_5760_resize by brucemir, on Flickr



DSC_5761_resize by brucemir, on Flickr



DSC_5765_resize by brucemir, on Flickr



DSC_5766_resize by brucemir, on Flickr



DSC_5774_resize by brucemir, on Flickr



DSC_5775_resize by brucemir, on Flickr



DSC_5778_resize by brucemir, on Flickr



DSC_5779_resize by brucemir, on Flickr



DSC_5786_resize by brucemir, on Flickr



DSC_5787_resize by brucemir, on Flickr



DSC_5788_resize by brucemir, on Flickr



DSC_5790_resize by brucemir, on Flickr



DSC_5791_resize by brucemir, on Flickr



DSC_5792_resize by brucemir, on Flickr



DSC_5806_resize by brucemir, on Flickr



DSC_5809_resize by brucemir, on Flickr



DSC_5812_resize by brucemir, on Flickr



DSC_5824_resize by brucemir, on Flickr



DSC_5825_resize by brucemir, on Flickr


505nm
DSC_5827_resize by brucemir, on Flickr

MS-SSW-II / NDG7574 Build Review

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I recently won an auction on eBay for a new NDG7574 diode and decided to put it into a special host I had been saving for several years. It is the MS-SSW-II host from sinner also known as sinner's secret weapon. This is a large host which takes two 26650 batteries. I wanted to drive it at 2 amps, but didn't have a driver set for that current, so I went back into my stock and used one of my continuous ground adjustable X-Drives from Lazeerer. These have been unavailable for over two years. This laser measures 1100 mW and is quite heavy in the hand.

I want to thank BowtieGuy for his assistance with this build as the MS-SSW-II is a press fit host with no set screw. I have used it before and it is great except if you ever need to replace the diode. Jeff converted the heat sink on this one to one with a set screw and also polished it and sent me taps and drill bits for two different set screws plus the set screws and allen wrenches. This build would not have worked out nearly as well without his help and I greatly appreciate it.

The first photo is of the heat sink with the diode pressed into a 12 mm module and inserted in the heat sink. You can see the size of it from the 12 mm module inside the heat sink.


After setting the driver to two amps I decided to adhere it to the inside of the pill with Arctic Alumina thermal adhesive. I had to drill a new hole for a ground screw and then clamp the driver's IC to the inside of the pill to allow it to set up.


Here is a shot of all the host parts dissembled while the adhesive is curing.


Here is a picture of the driver in the pill. Notice I added a small heat sink to the inductor as it runs hots too.


here I have installed the positive spring for the battery connection. The pill on this host screws into the battery tube making it part of the total heat sink.


With everything finished and tested on my power supply, I assembled the host and added a 520nm sticker then installed two fully charged 26650 batteries.


I tried an indoor beam shot, but at 1100 mW it was so bright, even in the well lit room, that the photo was overexposed.


It was getting quite late out, but I managed to take a quick beam shot outside on my porch. I had the laser in one hand and my camera in the other.



Thank you for looking over my newest laser. I hope you enjoyed looking as much as I enjoyed building and reviewing. :yh:

Nubm0at

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I won a NUBM0AT at auction and tested it with it's GBall intact, I expected it would be a NUBM08 as the new designation is a mimic NUBM0AT as in Ohh Ate Tee.......anyway it comes on the new thin backing plate and at 4.5a is doing 6790mw, it looks like 450-455nm

So these are putting out NUBM44 power in a brighter blue 450-455nm, too bad about the GBall but a backwards then forward G2 would let it run GBall intact and could be corrected.

I have not pulled the can yet to check the natural divergence, but I expect future diodes will get even stronger and will likely be in this format, the spot out of the GBall makes a 25mm x 6mm bar at 2 meters, there may be some that focus better depending on the natural divergence, it's a strong burner on the desktop.

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