It would be interesting to test Stanley HCNW115AJTE
If top bins are orderable, that could be a win.
Interesting, the package does look a bit weird though!
One difference: the Stanley has two bond wires.
Luminus now has a new LED on the site, the XP-G2 sized brother of the SST-40, the SST-20 (datasheet).
Features:
Maybe 220-230cd/mm^2 are possible? Benefits here are that the new Luminus LEDs seem to be chaeap and easy to obtain. They also seem to still have a cool-white tint after de-doming.
Love those bond wires… :person_facepalming:
I wouldn’t worry about those right now. The SST-40 goes up to 9A and also had just two. It’s possible that they use the same ones in this LED.
And, though not the scope of this thread, the SST-20 comes with some warm 95 CRI versions.
Not too concerned with current capabilities, those long bond wires make it very hard for a clean de-dome. They tend to break when the dome releases during the chemical de-doming process. I went thru over 30 SST-40’s. Vinh gave up on them too, he just shaves them now.
I wish a purely chemical dedome would be easier with these, but I’m not holding my breath. I’ve had good luck with a combination of shaving / slicing / chemical dedome. Considerably more work, but still good results.
click for larger image
SST-20 L2 6500K is available on kaidomain for $3.19.
prophotonix never answered.
I found 2 more companies which may be willing to make a batch of custom LEDs:
At least the latter has the necessary expertise:
I haven’t mailed them, if one wants to do it - just do it.
What is the die size of old XP-G2?
Here I see 2.16 mm².
In the CRX thread 1.66 mm² for old and 2.18 mm² for new…
200 cd/mm² seems semi-consistent with the smaller number.
1.66mm^2 for the first version from 2012-2014
Then koef3 got about 216 cd/mm²
One thing to note here is that the way of measuring the die size is not perfectly accurate. It is usually done by carefully taking a picture and then counting pixels.
What about this LED (don’t know if this LED is already discussed)?
http://www.nichia.co.jp/en/product/led_product_data.html?type='NJ2W270A-Y7'
I noticed it a few months ago, but didn’t see any big benefits. The rectangular shape of the die is definitely a downside.
They do state the luminance!
Die size: 0.93mm^2
Real thermal resistance: typ 4.1cd/mm^2
Luminance at 700mA: avg 110cd/mm^2
Edit:
The Black Flat is 20% larger, but only does 66cd/mm^2 at 700mA. So the Nichia might actually be really good if one can live with the die shape! Thanks Schoki!
Edit2:
The weird thing is that it’s a 6V LED! This makes it easier to drive the LED to its max in single cell lights, there are good boost drivers available.
I wonder how far apart the two dies are. This could ruin the beam with smo reflectors.
OK, so let’s consider the dies separately, so we can compare with Blackie a bit better.
Half-Nichia:
.465 mm² die. 110 cd / mm² at 1.5 A/mm² and 5 W/mm².
Blackie:
1.122 mm² die. 110 cd / mm² at 1.25 A/mm² and 3.85 W/mm².
Nichia has a bit better thermal resistance, but it doesn’t seem to be enough.
Also, its LES is significantly higher than die size in case of Nichia.
So probably not too good….
I think we really just need to wait for the new Osrams.
I need some clarification here: candela is Lumens/Steradian, so the value changes with the amount of dies I place next to each other?
Yeah, I’m keeping tabs on octopart, hopefully soon they will be available in individual units.