Spectro-ing the new Nichia 1.4W "462nm-470nm" NDB7675

ZRaffleticket · Jun 4, 2014

Man you're PUSHING that diode.

...I was expecting to get a nice royal blue without the purpleish hue to it... but now... ha, nope. Ugh, better be prepared to shell out some extra $$ to put it in a nice host... I do have another ranger host sitting around--

Atomicrox · Jun 5, 2014

ZRaffleticket said:
...I was expecting to get a nice royal blue without the purpleish hue to it... but now... ha, nope. Ugh, better be prepared to shell out some extra $$ to put it in a nice host... I do have another ranger host sitting around--

What do you mean? Yours is still purplish?

ZRaffleticket · Jun 5, 2014

Mine's still in the mail.

To clarify, I originally expected it to be like a 445 without the purple hue... now I'm expecting another 473'ish color since WBS said his is indistinguishable

Atomicrox · Jun 5, 2014

Ah, OK

I thought you received an unlucky low diode.

Mine's on the mail as well, and now I regret buying it set to 1.8A. Might have to re-set to 2A or 2.2A before building.

And to add - my Dominator is a royal blue with very little purple and I sort-of-metered-it at ~454nm.

ZRaffleticket · Jun 5, 2014

I did driver separately. Gonna do what WBS did of course and push 2.4A

Hopefully these don't generate a lot of heat for a decent runtime...

__

Edit:

After some PM's with WBS, it sounds like the color would be noticeable side-by-side. The diode is a slightly lower WL than 473.

Also he's either on the low end of the power efficiency or he's on the downward slope of the power graph, ~1.7W with a 3 element lens. Also sounds like the duty cycle is the same as any other 445.

There'd be better detail coming straight from him in his review whenever that gets posted, just thought I'd share this while he sits on that 5000th post

Cyparagon · Jun 5, 2014

wannaburnstuff said:
if anyone (reputable) wants to spectro it let me know.

I've got a spectrometer (same model as RHD's, actually), power meter, and bench supplies. I'd be happy to - if you pay shipping. PM me if you're interested.

busman2 · Jun 5, 2014

Hmmm, I had mine set to 1.8A I wonder how much colour shift that extra .6A gives it???

rhd · Jun 14, 2014

I pushed one of these diodes - very interesting results.

As a word of warning, the 2.9A test displays VERY significant dimming, accompanied by very significant (non-linear from the looks of it) wavelength ramp-up. The move from 2.8A to 2.9A alone brought substantial noticable wavelength shift - just that 100mA increase. It also brought what subjectively looked like a 25% dimming in output. FWIW, the diode pulled back from 2.9A just fine, and is behaving as it was previously, without any indication of damage.

2.4A

2.6A

2.8A

2.9A

IsaacT · Jun 14, 2014

Amazing! It looks like that is on a lower wavelength curve than the one I received. You have 5 of these correct? Any plans to measure the rest?

2.9A is intense, but to get over 473nm itself is quite a feat! I don't plan to up my build's current, but this is a great insight into these diodes!

EDIT: Cyp tested mine at various currents also. At 0.2A he found 460nm, at 1A he found 462nm, and at 1.8A he found 466nm. The graph at 2.4A for mine(courtesy of Cyparagon) is right here:

rhd · Jun 14, 2014

IsaacT said:
Amazing! It looks like that is on a lower wavelength curve than the one I received. You have 5 of these correct? Any plans to measure the rest?

2.9A is intense, but to get over 473nm itself is quite a feat! I don't plan to up my build's current, but this is a great insight into these diodes!

I'm going to spectro all 5, not at 2.9A, but likely at 2.4A or 2.5A

For my current diode, I'm going to set it at 2.75A and enjoy the hue for as long as it lasts.

IsaacT · Jun 14, 2014

Updated my post with the graph Cyparagon made for me and his findings at other amperages. If anyone has the time, please shoot some rep his way as I can't give him more as of yet.

RayJay · Jun 14, 2014

474!! Wowsers! That is incredible.. I would love to know what the output was at 2.9A..

Down with Umbrella · Jun 14, 2014

I wonder how long they will last, now I wish I would have set mine higher than 2.0A. O well I can change that if I really want to

THANK you so much for you all who participated in this experiment.

rhd · Jun 14, 2014

Down with Umbrella said:
I wonder how long they will last, now I wish I would have set mine higher than 2.0A. O well I can change that if I really want to

THANK you so much for you all who participated in this experiment.

What I would really like to know, is how this behaves past that kink. I'm starting to wish I had pushed harder for a murder fund.

Ie, does it go to 478 at 3.2A, but lose 80% off it's power? Can it sustain that current repeatedly? Etc

IWIRE · Jun 14, 2014

I'm kind of wishing I would have pushed mine past 2a also. I got scared

That's where the output started to slow down climbing in relation to current draw. Maybe it will live a long happy life.
Thanks rhd for all the info you share. It really helps us new guys out. :beer: REP +1

Down with Umbrella · Jun 15, 2014

rhd said:
What I would really like to know, is how this behaves past that kink. I'm starting to wish I had pushed harder for a murder fund.

Ie, does it go to 478 at 3.2A, but lose 80% off it's power? Can it sustain that current repeatedly? Etc

Yes sir. @ 2.0A it is still impressive but it would be nice to break the 470 mark. I reallllly don't want to have to buy another one.

Spectro-ing the new Nichia 1.4W "462nm-470nm" NDB7675

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