First look at Nichia 119D D340 sm505 R70

Received the engineering sample from Nichia today.
I requested the 119D instead of 219D because I’m still curious and optimistic that 119 footprint will outperforms 219 on my VR16S1 board as I suspected months ago. The larger total cooling area plus larger current capability with 119 footprint should nett higher max output than the less than optimal 219 thermal pad surface. This 119D also very interesting with it’s “glass lens” as described in the data sheet. Let’s find out if this new LED has something new to offer for BLFers.



I made a new improved measurement methods which is far more reliable than my earlier tests. There’s a sandwich of aluminum adapter - lapped thick copper clamped on a thick cast iron mini milling machine’s bed. The addition of 5 digits volt meter makes a huge difference in measurement consistency. An LED is very sensitive to heat changes and the forward voltage reading is a very reliable data to measure its junction temperature down to 0,1 C. Using the forward voltage we can always go back to the same junction temperature between each measurements. This way the LED can be used as an accurate thermometer (some math involved).
Each measurement recorded only when the Vf stabilized. This means my new testing method puts much more stress on the LED as it had to stays in the test current for ~1-3 minutes before moving to another step. The test started at 27,2C (aluminum adapter temp) and ended at 28C, the change was too small to make any difference.
This way, even though I still don’t have a proper Integrating sphere for direct output measurement, anybody can use the curve and interpolate the lux reading with a valid base point. The lux meter used was TASI 632A with good performance as tested by Djozz here.

AWG 24 wire used tested to have less than 0,0002 V voltage reduction/meter. I used 50mm wires to connect the LED to the volt meter.

The lux meter sensor placed behind the table under a frosted diffuser (not shown). Measurements done in complete darkness to avoid errors from shadows or my movements.

Output test result was a disappointment. I guess this LED is a lower cost alternative to 319A for streetlight projects. Below 3A the performance is superior to 219C D320 and very close to 319A D440f2.

I converted the lux measurements to D340 bin which should output in 340 - 360 lumens at 700mA. Based on Djozz, Texas_Ace, and Maukka tests Nichia has been very consistent with it’s output binning. I used 350 lumens at 700mA at 25C as the base conversion point. The converted output matched Nichia’s chart very well.

Just in case you’re wondering if it’s the MCPCB or the LED which caused the lower output. Here’s a comparison of my earlier back to back test between Sinkpad copper DTP vs VR16S1 aluminum non DTP:

Chart:

Dedome result was a success. This is the EASIEST dedoming I’ve ever done. Just a simple peel with a sharp knife and most of the dome fell off the die easily. I was right, the phosphors-silicone mix glued behind a small hard glass window. This explain the higher efficiency (below max current) compared to the older 219C. With multi refractive index primary lens more photons escape the die.

My prediction is this dedomed 119D/219D will suffer less loss compared to traditional LED with single medium primary lens. I will dedome a fresh 119D and test the intensity tomorrow. We now have a true Nichia 119D HI! The phosphor is still protected after dedoming process

LAZY BEAMSHOTS with no lux measurements. I’m too lazy to make another test rig. The reflectors I have are just too big for this 16mm MCPCB. And the TIR optics needs to be fastened for a horizontal lux measurement. I only use simple ceiling beam shot with 20mm 5 degree Yajiamei XP TIR optic.

WB = 5600K, Same speed and aperture settings. All test were done at the same 1A setting to make it easier to see output differences.

IMHO, the dedomed 119D looks best if we ignore the magenta ring.

If anyone interested. The sample is available for evaluation for USD 0,8/pc. The price is just to cover JPN - ID, DHL express shipping cost only, no duty tax this time fortunately.
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UPDATE 190216: 119D vs 219D test result:

- Clemence

:+1: Looking foreward to your results.

Very excited to see a Maukka test! :smiley:

:+1: :slight_smile:

The output and max current are not my real concern. I expect this to be approximately lower than 319A. It’s the dedomed performance capability what interests me more. Unless Nichia put the “hard glass” wording wrong in the data sheet… then this is just another slightly brighter upgrade to 119C/219C.

- Clemence

Well, we can be hopeful, but I believe there has never been a flip-chip LED (no bond wires) with a high luminance dedomed.

OP Updated with test result!

Thanks for the test! And looking forward to the dedoming attempt.

Yup, next test (tomorrow) will be dedoming capability.

- Clemence

Thanks maukka!
What is Tj at high current?

I think a good predictor of the general luminance performance is whether the area around the die emits light. If the side areas emit a lot of light (like XPG3, 219C) the die luminance is lower. That light being emitted from the side areas was produced in the die, but is not emitted from the die area, thereby reducing the die luminance relative to if that light was emitted from the die itself.

The dedomed XHP70.2 was a big increase over stock.

You mean over the first generation? I don’t know if it was a big increase, and it’s still not a high luminance emitter. I think most of the improvement over the XHP70 has to do with the less dim cross of the XHP70.2. In a reflector light the dark spaces between the dies decreases the peak beam intensity, and so the XHP70.2 takes less of hit with its less-dark cross.

I think Clemence’s new avatar is too colorful and now everybody gets us mixed up.

Not as colorful as yours. There are at least three people with lookalike avatars in BLF :partying_face:

- Clemence

Thanks Clemence!
What is Tj at high current?
:wink:

I don’t know, didn’t measure it. Judging from the aluminum adapter temp and the board and thermal resistance it’s still far from 150C. It’s easy to measure later. All I have to do is just heat it to two known temperatures and measure the forward voltage as fast as possible.

- Clemence

I like your test setup :+1:
If you add a disc with cutted slots or holes in the chuck you can repeat Foucault’s light speed experiment.

Thanks.
I’d prefer to just examine his results (for now) than to repeat it. :stuck_out_tongue:

UPDATE 180622:
Dedoming attempt was a success! Check OP for details

- Clemence

Ohhh boy, game on! Looking forward to your impressions.