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Old 02-26-2014, 01:03 AM #97
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

Quote:
Originally Posted by shokkunlasers View Post
The backplate on which the diodes are mounted is finned or connected to a finned heatsink and then this is fan cooled
Ah, thanks. I imagine that grouping would make a fair bit of heat.


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Old 02-26-2014, 01:26 AM #98
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

Quote:
Originally Posted by shokkunlasers View Post
The backplate on which the diodes are mounted is finned or connected to a finned heatsink and then this is fan cooled
and very likely a TEC..
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Old 02-26-2014, 12:18 PM #99
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

Rick...THANX for being the FIRST to post about these beauties !!!!!!!!!!
And taking the Risk to push them hard !!!!!

MMMMMmmmmmm.....when/if the price drops....Beam's Crystal Ball see's a change-out in the Tridentis.....3 x 6 = 18 W..Com'on !!! That way lies Madness !

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Old 02-26-2014, 01:20 PM #100
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

6w could be safe will have to do more testing .I was getting 6w at around 3.9A in the video took it to 4.35A got 6.39W and driver got hot. may have gone higher will have to do more testing

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Rick...THANX for being the FIRST to post about these beauties !!!!!!!!!!
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Old 02-26-2014, 04:21 PM #101
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

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Originally Posted by ricktrent4 View Post
6w could be safe will have to do more testing .I was getting 6w at around 3.9A in the video took it to 4.35A got 6.39W and driver got hot. may have gone higher will have to do more testing
I'd say a test at 3.9A *might* be a good idea to see how the diode performs at that current. Give the laser 3.9A for 20-30 seconds and see what the results are. I think the diode should be able to handle that current safely for a little while at least- I hope :$
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Old 02-26-2014, 04:30 PM #102
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

Get that diode off the driver and on the PSU.
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Old 02-26-2014, 04:38 PM #103
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

I have this one coming in this week DTR told me about it looks like a good one at a good price . MASTECH Variable DC Power Supply HY3010E 0 30V 0 10A | eBay

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Get that diode off the driver and on the PSU.
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Old 02-26-2014, 04:38 PM #104
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

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Originally Posted by kaunak View Post
I think the diode should be able to handle that current safely for a little while at least- I hope :$
Until we have a power vs current graph of to determine efficiency and find the knee of the diode a safe current can't be assumed.
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Old 02-26-2014, 04:48 PM #105
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

Quote:
Originally Posted by ricktrent4 View Post
6w could be safe will have to do more testing .I was getting 6w at around 3.9A in the video took it to 4.35A got 6.39W and driver got hot. may have gone higher will have to do more testing
I would say your already into diminishing returns there.
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Old 02-26-2014, 07:23 PM #106
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

Quote:
Originally Posted by DTR View Post
Until we have a power vs current graph of to determine efficiency and find the knee of the diode a safe current can't be assumed.
Yeah it's too early to tell what a safe op current is near the high end, but deducing from the original test Rick did, I would bet 3.15 is safe(producing around 5W). Of course I do hope we can get 6W out of these safely, but 3.9A *might* be a little too high for a single 9mm; we do not know yet. I would love to see ARG test these diodes, but after testing the 1w 520, there really isn't any interest in the 3.5w diodes, which is unfortunate, because a safe 5w+ 445 out of a single diode is a slightly more impressive to me than a 9mm running @ 2.5A producing 1.4w of 520. ( many people will disagree though )
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Old 02-26-2014, 09:59 PM #107
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

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Originally Posted by jander6442 View Post
Get that diode off the driver and on the PSU.
Umm, yeah. What he said ^^^

Is the current reading in this test the current into the diode or the current into the driver?
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Old 02-26-2014, 10:16 PM #108
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

Current in to diode ! I have a new POWER SUPPLY coming in 2/27 will retest MASTECH Variable DC Power Supply HY3010E 0 30V 0 10A | eBay

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Umm, yeah. What he said ^^^

Is the current reading in this test the current into the diode or the current into the driver?
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Old 02-27-2014, 04:11 PM #109
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

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Originally Posted by ricktrent4 View Post
Current in to diode ! I have a new POWER SUPPLY coming in 2/27 will retest MASTECH Variable DC Power Supply HY3010E 0 30V 0 10A | eBay
Sounds good let us know when it arrives; I am waiting on it as much as you are lol
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Old 02-27-2014, 05:08 PM #110
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

came in today will make new video soon!

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Sounds good let us know when it arrives; I am waiting on it as much as you are lol
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Old 02-27-2014, 05:13 PM #111
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

If you can do some testing @ 100mA intervals with cool down between each reading that would be awesome. Even if you just start near datasheet max to make it simple that would give some very useful info.
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Old 02-27-2014, 05:55 PM #112
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Default Re: New Generation 445nm Diodes: Nichia NDB7A75

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came in today will make new video soon!
DTR's idea of 100ma increments sounds good. I would stop the test at 4.5A for safety and let someone on here plot out the data.
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