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Old 09-24-2016, 11:40 PM #1
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Default My New 3W Kryton Groove NDB7875 445nm Laser!

Hey guys, I recently purchased this complete Kryton Groove laser from grainde. It uses the NDB7875 and outputs 3 Watts! This host is really beautiful and quite remarkable as well. Here is the for sale thread where I first saw it.
http://laserpointerforums.com/f39/la...ove-98469.html
Anyway here it is in all its glory, enjoy the pics







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Old 09-24-2016, 11:52 PM #2
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

I've got that same diode in a sinner MS-SSW II host with a 2.4 amp X-Drive and G lens that outputs a touch over 3 watts. You should get into building your own eventually. Nice laser.
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Old 09-24-2016, 11:55 PM #3
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

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Originally Posted by paul1598419 View Post
I've got that same diode in a sinner MS-SSW II host with a 2.4 amp X-Drive and G lens that outputs a touch over 3 watts. You should get into building your own eventually. Nice laser.
Yeah I have built two so far myself seen in my signature the NUBM44 and M462 lasers. I am currently building a BDR-209 in a micro host from jayrob, everything is ordered and paid for so I'm just waiting for the mail to come I didn't build my own NDB7875 because I saw this host and I absolutely loved it
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Old 09-25-2016, 03:39 AM #4
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

Oh, okay. Do you think that BDR-209 will be happy in a small heat sink? You should probably limit the duty cycle to way under a minute, unless you are planning on under-driving it.
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Old 09-25-2016, 03:56 AM #5
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

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Originally Posted by paul1598419 View Post
Oh, okay. Do you think that BDR-209 will be happy in a small heat sink? You should probably limit the duty cycle to way under a minute, unless you are planning on under-driving it.
I usually don't keep any of my lasers on for more than 30 seconds at a time just for longevity reasons. I am going to run it at 600 mA and have it in a 12mm module inside the copper heatsink from the host which gives it an extra few mm.
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Old 09-25-2016, 04:07 AM #6
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

In that case, I would definitely limit the duty cycle to no more than 30 seconds. That's not enough heat sink for that diode at that current. It's a single mode diode and you should use a G lens or another aspherical single element lens. You'll probably get about 950 mW using it that way.

Edit: if you drove it at 450 mA you would get 700 mW or better and decrease the amount of heat and probably increase the diode's life.
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Old 09-25-2016, 04:23 AM #7
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

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Originally Posted by paul1598419 View Post
In that case, I would definitely limit the duty cycle to no more than 30 seconds. That's not enough heat sink for that diode at that current. It's a single mode diode and you should use a G lens or another aspherical single element lens. You'll probably get about 950 mW using it that way.
Yeah I got it with a G2 lens from DTR, here's the pic from his website where its driven at 600 mA it looks like it should be the ~950 mW I want! I heard this thing can burn things over 30 feet away
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Old 09-25-2016, 04:27 AM #8
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

Yes, that's true, but I edited my last post. With such a small heat sink you would have a very short duty cycle and it might decrease the life of the diode. If you want it in a tiny host, you would be better off driving it at 450 mA.
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Old 09-25-2016, 04:33 AM #9
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

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Yes, that's true, but I edited my last post. With such a small heat sink you would have a very short duty cycle and it might decrease the life of the diode. If you want it in a tiny host, you would be better off driving it at 450 mA.
Well if it burns out I'll just buy another one, the diode itself is only $32 its not like an nubm44 or such that are much pricier haha I MUST HAVE THE POWER

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Old 09-25-2016, 04:44 AM #10
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

That particular diode is not very forgiving. You would do yourself a favor by saving the small host for another build and using something more substantial for this one. I have a 405nm that does 700 mW in a huge aluminum heat sink and it has never failed me in a very long while. I think it's because that diode is only 3.8mm in diameter that it dislikes being over-driven so much.
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532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
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Old 09-25-2016, 04:50 AM #11
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

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Originally Posted by paul1598419 View Post
That particular diode is not very forgiving. You would do yourself a favor by saving the small host for another build and using something more substantial for this one. I have a 405nm that does 700 mW in a huge aluminum heat sink and it has never failed me in a very long while. I think it's because that diode is only 3.8mm in diameter that it dislikes being over-driven so much.
But but but but but I wanna pop balloons at a super long distance covertly and i dont know if 500 mA will do that for me

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Old 09-25-2016, 05:00 AM #12
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

I'd use a larger heat sink then. Even at 500 mA that small host is not enough for that diode. If you don't mind waiting to get another diode and pressing the old one out and pressing the new one in and doing all the soldering and everything else that will come with the failure of the diode; might even destroy the driver, then go for it.
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488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
532nm 200mW thermostatically Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PSU New
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
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635nm 5mW pointer
635nm 100mW pointer
650nm 65mW pointer
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Old 09-25-2016, 05:02 AM #13
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

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Originally Posted by paul1598419 View Post
I'd use a larger heat sink then. Even at 500 mA that small host is not enough for that diode. If you don't mind waiting to get another diode and pressing the old one out and pressing the new one in and doing all the soldering and everything else that will come with the failure of the diode; might even destroy the driver, then go for it.
You have me concerned, so I will power up the diode in the 12mm module with my PSU before I put it in the host and see how warm it gets quickly.

Edit: I have my M462 in a 12mm module inside a heatsink much like the one I am going to make with the BDR-209 and the M462 works just fine as long as I keep the duty cycle less than 30 seconds/60 seconds.

Last edited by HydroSean; 09-25-2016 at 05:12 AM.
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Old 09-25-2016, 05:13 AM #14
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

Yeah, those little diodes seem to just all of a sudden fail, and then you are stuck with having to redo the whole thing all over again. Just because you think it is not getting too hot as fast as you think it should, don't think it can't fail.
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Old 09-25-2016, 05:21 AM #15
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

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Yeah, those little diodes seem to just all of a sudden fail, and then you are stuck with having to redo the whole thing all over again. Just because you think it is not getting too hot as fast as you think it should, don't think it can't fail.
Have a little faith man lol like DTR says, if you cant afford to get burned a few times then this is the wrong hobby to be in plus I love soldering and making these lasers, if it were to fail then I'd still have fun repairing it I enjoy the challenge

Last edited by HydroSean; 09-25-2016 at 05:21 AM.
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Old 09-25-2016, 05:32 AM #16
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Default Re: My New 3W Kryton Groove NDB7875 445nm Laser!

Nice Kryton buddy
I have one in my sig that I built also, not a bad host!



you should know if you purchase the BDR209 with the Nano boost-buck driver preset to 500ma from Jordan he offers warranty on the preset module and these drivers are the best choice for blueray diodes, I have 3 mini blueray builds all with the nano set to 500 and all going strong, good luck buddy!
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Last edited by badboybilly; 09-25-2016 at 05:38 AM.
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