First look at Nichia 119D D340 sm505 R70

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.

Sorry, I still haven’t done the lux test for the dedomed 119D yet. Was too busy tour-guiding my friend’s family. Here’s some pictures, mind the quality they’re taken with my old phone’s camera.

Been living in Bali for almost 5 years but never knew this place. Penglipuran Village

The area is canopied in dense bamboo forest. This is a public roadway. Conserved and harvested by traditional local regulation to keep it that way for hundreds of years.

A nice snorkeling/spearfishing spot 7 driving minutes from my workshop:

Cheap fresh seafood in Kedonganan fishermen village:
You can buy them directly from the traditional market (equipped with modern digital scale) and get them grilled in the “budget restaurants” next to the market. This way you’ll get roughly 1/3 the cost as if you spend in fancy “tourists” restaurants in the area.

- 1kg Travelly = USD 4,3

- 0,5kg Tiger shrimps = USD 4

- 0,5kg cuttlefish = USD 3,5.

  • The grilling cost is USD 2,8 (1,4/kg whatever it is).

- Clemence

Looking amazing Clemence!

I want to try that shrimp!

UPDATE 180626:
Beam shots added

- Clemence