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Old 07-16-2017, 10:53 PM #433
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Default Re: 505nm and 480nm diode RESULTS

476... holy crap. Mine is 472 at 2.4A, and noticibly gets greener as it heats up... but 476 is real high. At least the color shifts a lot per nm in this part of the spectrum, so I would expect you to be able to see a difference if you looked for it.

The only problem with the 505's are that the different part numbers seem consistent in WL with ones of the same number.


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Old 07-16-2017, 10:56 PM #434
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Default Re: 505nm and 480nm diode RESULTS

I'm not sure it's 476nm, could be a bit less, but it's definitely above 473nm as I compared it side by side with a DPSS. It does look kinda greenish at max, pretty cool and strange color. Really hoping it won't die a quick death from overcurrent.
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Old 07-16-2017, 11:07 PM #435
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Default Re: 505nm and 480nm diode RESULTS

That's really over driving the NDB7675. I don't think anyone is going to be able to over drive these single mode diodes to that extent. If you try, you may end up with an LED or worse. Multi-mode diodes take being over driven like this much better than small power single mode diodes do. I didn't push these terribly hard, but most didn't increase in WL after 250 mA. They seemed to stay right at that WL even at 350 mA.
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Old 07-16-2017, 11:09 PM #436
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Default Re: 505nm and 480nm diode RESULTS

I've been running my 462 at 2.8A for a long time now, only thing showing signs of wear is the driver. Granted it's my fault... I kinda messed up the pot on that one... It's weird though, it still is very much so a royal blue and is not quite as close to 472 as I thought it would be, but it's definitely 'greener' than a 450 I had (which is now dead).

And yes, the color difference between my 480 and 472 is astonishing. Even when it seems really blue-green in color, the 480 blows it out of the water in color. I love it. For the life of me I can't even photoshop a color that's close enough to it to present here. If I'm doing this, I'm gonna do it right.

I'd say the same for the 476/480 I had a long time ago. It was very different from 473.
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Old 07-16-2017, 11:28 PM #437
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Default Re: 505nm and 480nm diode RESULTS

I don't disagree at all. The color of 478nm and 480nm is really different from the blue diodes we've all known for awhile now. My point is that I don't think you are going to be able to shift the WL much more than it was when I tested them. I wouldn't even try.
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Old 07-17-2017, 12:15 AM #438
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Default Re: 505nm and 480nm diode RESULTS

With the amount of dead diodes I'm not going to try. Will set max current somewhere in the 200-300mA range and that's it.
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Old 07-17-2017, 02:17 AM #439
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Default Re: 505nm and 480nm diode RESULTS

Quote:
Originally Posted by Atomicrox View Post
With the amount of dead diodes I'm not going to try. Will set it max current somewhere in the 200-300mA range and that's it.
I'll probably set my "473nm" diode to 200mA since the wavelength does not increase beyond that.

Also, my diode from Newgazer arrived tonight. So tomorrow I should be able to spectro it if I find time. I can confirm that the diode that arrived is indeed the SB1573N91
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Old 07-17-2017, 02:50 AM #440
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Default Re: 505nm and 480nm diode RESULTS

That's interesting. I think I have five more coming tomorrow and I will be measuring their WLs. I haven't seen one of these yet, so I have no idea where they will fall. Might be on the lower end of 505nm or somewhere around 510nm. But, then I might be totally surprised.
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Old 07-17-2017, 08:46 PM #441
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Default Re: 505nm and 480nm diode RESULTS

Has anyone plotted the impact that temperature has on blue shift? As in, how low do these things need to go for a 5 or 8nm shift?
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Old 07-17-2017, 09:01 PM #442
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Default Re: 505nm and 480nm diode RESULTS

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Originally Posted by bloompyle View Post
Has anyone plotted the impact that temperature has on blue shift? As in, how low do these things need to go for a 5 or 8nm shift?
None of these diodes measured so far has even made it to 480nm. I can't see where anyone would be interested in seeing how much lower in WL they can be shifted by cooling. The highest one I've seen so far is 478nm.
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Old 07-17-2017, 09:33 PM #443
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Default Re: 505nm and 480nm diode RESULTS

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Originally Posted by bloompyle View Post
Has anyone plotted the impact that temperature has on blue shift? As in, how low do these things need to go for a 5 or 8nm shift?
For the 505nm diodes? My 505nm diode only shifts approximately 1.1nm from 70mA to 160mA. So seeing as these don't shift much with current I'd think that they wouldn't shift much with temp (relative to other diodes). I'd think that they'd have similar wavelength shift with temperature as with the other green diodes.


Quote:
Originally Posted by paul1598419 View Post
None of these diodes measured so far has even made it to 480nm. I can't see where anyone would be interested in seeing how much lower in WL they can be shifted by cooling. The highest one I've seen so far is 478nm.
Paul, quick heads up, the diode I get from Newgazer has the same pinout as stated on the data sheet posted with their ebay listing. Which is case positive.
So it is NOT the same pinout as the 473nm diodes.
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Old 07-17-2017, 09:37 PM #444
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Default Re: 505nm and 480nm diode RESULTS

Didn't mine make it to 480.2nm paul? That is what was on your sticker
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Old 07-17-2017, 10:02 PM #445
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Default Re: 505nm and 480nm diode RESULTS

I have got a cr2 keychain kit from jayrob for my 480nm build i am just not sure of what current to set the driver at that will be safe for the host.
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Old 07-17-2017, 10:20 PM #446
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Default Re: 505nm and 480nm diode RESULTS

What driver do you have? I don't think anybody here plans to run theirs past 275mA.

Now if you want to play it safe, just run it at 125mA (manufacturer suggested current).
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Old 07-17-2017, 10:25 PM #447
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Default Re: 505nm and 480nm diode RESULTS

I am going to use a microboost drive v5 would i be able to see the beam in the dark at 125ma.
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Old 07-17-2017, 10:30 PM #448
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Default Re: 505nm and 480nm diode RESULTS

They are rated to be 55mW at that power, so you should be able to. I can see the beam on my 20mW 488nm at night, so I imagine these aren't far off.
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