NUBM44 6W+ 450nm Laser Diode

Minamoto Kobayashi said:

I'm waiting again for mine ...
So there is not so much difference between the two cells.
I expected a greater difference ...

Click to expand...

That is a good difference.
From a full charge the Panasonics are down to 7.4v in 10 seconds but the LG's are holding at 7.75.
That's percentage wise much better as well.
The LG's will survive longer and will maintain minimum driver voltage to a lower discharge voltage.
UPDATE:
After further testing with older NCR18650pd and other cells it's become apparent that INR's are a must for the NUBM44 and NUBM07E or any of the 4 watt + diodes when using the SXD drivers and just 2 cells in series if you want to maintain full power for more than 60 seconds.

I tested my NDG7475T 1.2W 520nm green against my NUBM44 6 watt blue laser tonight side by side, both have two inch diameter lenses in an expander setup and looking at the two together, the NUMB44 is wider but the brilliance isn't that far behind the 1.2 watt 520nm diode. I expected them to be further apart. From this I've got to admit, with an expander, the NUBM44 is a very good alternative to a one watt 520nm laser diode at less than half the cost for the diode.



The camera picked up the blue better than it should have, it actually appears a bit brighter than the green when the reverse was true. I didn't realize it at the time, but I had the thin edge of the green towards the camera, this makes the blue appear several times wider when it is really more like 2X the width of the green. To get an idea of the difference of intensity, look at the two beams about half way out by scrooling the screen so you can only see the second half of the green beam, that's about what they looked like in relative intensity, although my camera made the blue look a bit violet, in person it is quite blue.

Alaskan said:

I tested my NDG7475T 1.2W 520nm green against my NUBM44 6 watt blue laser tonight side by side, both have two inch diameter lenses in an expander setup and looking at the two together, the NUMB44 is wider but the brilliance isn't that far behind the 1.2 watt 520nm diode. I expected them to be further apart. From this I've got to admit, with an expander, the NUBM44 is a very good alternative to a one watt 520nm laser diode at less than half the cost for the diode.

Click to expand...

Have you tried a NUBM07E yet? You will never look at 445nm the same LOL

Haven't read anything about it but now that you mentioned it I just went and looked, it beats the pants off of this NUBM44 for brightness when driven to 5 watts out reaching 470nm... OK, I'm going to buy one of those next

Thanks!

Alaskan said:

From this I've got to admit, with an expander, the NUBM44 is a very good alternative to a one watt 520nm laser diode at less than half the cost for the diode.

Click to expand...

And 5x the power consumption..........

Alaskan said:

I tested my NDG7475T 1.2W 520nm green against my NUBM44 6 watt blue laser tonight side by side, both have two inch diameter lenses in an expander setup and looking at the two together, the NUMB44 is wider but the brilliance isn't that far behind the 1.2 watt 520nm diode. I expected them to be further apart. From this I've got to admit, with an expander, the NUBM44 is a very good alternative to a one watt 520nm laser diode at less than half the cost for the diode.

The camera picked up the blue better than it should have, it actually appears a bit brighter than the green when the reverse was true. I didn't realize it at the time, but I had the thin edge of the green towards the camera, this makes the blue appear several times wider when it is really more like 2X the width of the green. To get an idea of the difference of intensity, look at the two beams about half way out by scrooling the screen so you can only see the second half of the green beam, that's about what they looked like in relative intensity, although my camera made the blue look a bit violet, in person it is quite blue.

Click to expand...

Which one is brighter without the expanders?

520nm is brighter with or without an expander, just that my camera made the blue look brighter than it was to my eyes. Even if you are pushing 6 watts out at 445-450nm using a NUBM44, the NDG7475T at 1.2 watts is noticably brighter but I'd say they are both in the ball park with one another, the NUBM44 coming up behind a bit, but nothing too shabby. For the money, I think the blue NUBM44 wins, and again for the money the NUBM07E at 4 watts out, due to its price, is close enough in brightness to compete with 1.2 watts of 520nm too. Of course it isn't as bright as 1.2 watts at 520nm, but the diode is so much less expensive it sure looks like a good choice. Use the link at the bottom of my signature to check how wavelength and powers compare from one to the other to see. If the beams are within 25 percent of one another as far as perceived brightness but the, for example, 75% as bright diode is half the cost... that's a motivating factor to go for the lower priced one in my book, even if it isn't quite as bright.

All of that said, dollar for dollar maybe it's a wash and costs the same for the NUBM44 or the NUBM07E and the NDG7475T if you have to buy a better host to handle the higher current and heat dissipation requirements of the higher wattage diodes

Bottom line, color counts too, blue is beautiful if you can get a powerful enough diode which both the NUBM44 and the NUBM07E diodes are capable of producing. PBS cube combine two of those blue babies for even more savings for the amount of light they produce and make a 1.2 watt 520 nm green diode look dim! Better have a big heat sink with some good fins on your host and use 26650 or 32650 batteries though

Thanks, that's exactly what I wanted to know

Edit: can you see the beams in daylight?

Very faintly if at all, depends if at high noon and clear sky or cloudy in the evening, then some if you look straight down the line as best you can.

Here's my tutorial on how to build a Nubm44 laser
... and it burning stuff.

OK, It's happened.
You remember that BB King song: The thrill is gone...can you hear it?
Anyway we were all worried that 6 watts was going to be Armageddon and yes it's been fun, but...it's like when you get a new motorcycle and think WOW I'm never going to use all this horsepower and by the end of the week you're bringing it in red hot with the tongue hanging out.
Well I officially am ready for more power.
For me 6 watts did not shatter the earth and it hasn't burned down my corner of the world.

Everyone must use safety glasses and be careful not to harm others of course.
I'm thinking 60-100w C02 but I would like to stay low voltage and air cooled.

Why do I need more power you may ask, it's simple....I am the Great leaf hunter of Stone Mountain, those little green monsters are planning an attack this fall and I must blast into ashes as many as possible before the invasion.
p.s. I blast em from the 2nd story into my own yard that is seriously bushy and I endanger absolutely nobody, always safety first. Yes I have fire extinguishers and long garden hoses front and back.

More power. Har har har
----Tim Allen, home improvement
Let's see if Binford Tools has what you need. Lol

trussmonkey25 said:

More power. Har har har
----Tim Allen, home improvement
Let's see if Binford Tools has what you need. Lol

Click to expand...

Maybe a caveman approach of just pointing 3 beams onto the same leaf?

Or how about a whole block of 05T's with the G-ball or 2 blocks stacked for a total of 16. They are only 2 cm x 6 cm

I own some pretty expensive test equipment but still not a LPM, I seriously need to buy a LPM, but I need one that can test 150 watts, yes I know you can split the beam being tested or use attenuation filters but that's crap, why buy a meter at all if you're going to guess with it.

My decanned 44 diode is starting to take a piss, but I have been beating the hell out of it every day getting it pretty hot running it well over 5 minutes with cells in series parallel, but it is in a large heat sink that all gets warm.
Side by side with my hardly used FL host 44 diode running @ 4.5 amps it appears the decanned diode has fallen well behind.

I think I am going to start working with the ball lens in place on the other diodes at least until we get some output measurements.
Seriously the entire 8 diode block is small, only 2 cm x 6 cm, I am gonna have to do something with one of these.
Maybe a mount to hold 8 additional lenses that will be adjustable then a large moveable for a variable final focus.
Anyone know if these blocked diodes are arranged with the bar/wide axis horizontal or vertical?
Actually looking at the spacing you could easily stack two blocks, might even need 1 mm between, how awesome would that be?
16 beams focused down to maybe a 4mm x 4mm beam of 16 pushing 80 watts :eg:

Does anyone know of or want to share a better deal on these, I could almost swear I've seem them for 569.00 somewhere. I just know they are going to drop 100 bucks the day after I buy one. The 07E block has dropped 100 since last week. Hell the V1 units are down to 599.
Nichia NUBM05T 455nm 465nm 30W High Power Multi LD Bank Blue Laser Diode | eBay

I could make a leaf burner out of this and wear camera goggles to view the beam focus but I want to stay with visible for many reasons.
20W 810nm IR laser illuminator for CCTV camera /300M long [OLNG300L] - $385.00 : Zen Cart!, The Art of E-commerce

I would like to get a single 05T and work with it with the Gball intact to see what optics yield the best results, I can't be sure but going open can with this 44 it has kinda faded down over time with a large drop recently, but perception is not scientific, hence my need for a LPM.
I know this is the 44 thread but as 05T's are basically 44's maybe someone running a 07E canless could meter it daily and chronicle results?

Matt F said:

Here's my tutorial on how to build a Nubm44 laser
... and it burning stuff.

Click to expand...

I keep getting error 400 messages

Okay thanks! the original post is working now

RedCowboy said:

That is a good difference.
From a full charge the Panasonics are down to 7.4v in 10 seconds but the LG's are holding at 7.75.
That's percentage wise much better as well.
The LG's will survive longer and will maintain minimum driver voltage to a lower discharge voltage.
UPDATE:
After further testing with older NCR18650pd and other cells it's become apparent that INR's are a must for the NUBM44 and NUBM07E or any of the 4 watt + diodes when using the SXD drivers and just 2 cells in series if you want to maintain full power for more than 60 seconds.

Click to expand...

How do you go about testing the voltage sag of a battery when you connect it to a laser?
I have been running my NUB44 with an SXB drawing 8.69 amps off either a single Sanyo NCR18650GA 3500 mAh 10A cell or an LG MJ1 3500 mAh 10A cell. I'm just curious how much these newer cells will compare to a Sony VTC5 in how much their voltage sags when supplying high currents like this.