Nichia 219C, testing a 5000K 83CRI emitter, comparing with a XP-G2 S4 2B and other leds

Does that graph mean it wouldn’t play well with a FET driver?
Back to the piggybacked 7135 drivers if we want to max the LED?
… or of course an LD-1 / LD-2 from LED4POWER.

Edit: Seems like 4.2volt from a fresh IMR18650 would be way too much power…?

Wow! This sounds like a great LED. Can’t wait till the high CRI versions come out.

Sounds like all my 219s will need to be upgraded sometime this year.

Great job on the review Djozz. :smiley:

Great work,djozz,as always.

When you take nichia's 80+CRI into consideration,nichia looks even better.

One question:could you please take a picture of XP-G2 S4 die?

I posted few pictures of "unusual" xp-p2 with definitely bigger die size (~2.3-2.4mm2 ) in this thread:

Oh boy oh boy oh boy. I sense a new triple S2 in the not so distant future! Thanks for all your testing djozz.

Great info! Pilotdog68 is right, these could be real winners in a 1504. With the larger die I’m not sure there’s much of a throw advantage, but more lumens, similar throw, and longer time in regulation. What’s not to like?

Wow thank you Djozz for such thorough testing and comparison!

I am interested in your thoughts on the tint/color rendering of this 5000K/83CRI version.

Thanks!

I didn’t realize the die is larger.

Also, someone above had a good point. The Vf is almost too low. You would have to use a linear driver with this one, no FETs. And it still isn’t as efficient as an XP-G2.

I fail to see the problem. A guppydrv flashed Q.lite and extra 7135’s is cheaper than a good FET driver. Besides the 1504 doesn’t last all that long with a FET driver and XP-G2 anyway. I doubt I’d notice the 10 minutes it loses, not everyone will feel the same way though.

Besides, the die is only about .3mm² larger, so if you can increase the output 13% over the Vf limited XP-G2 you’ve you’ve eliminated the advantage. While it’s not quite there at startup (the XP-G2 will throw slightly further) as the voltage drops the Nichia will overtake the XP-G2 because the Vf is so much lower.

It is more efficient than the XP-G2, the lower Vf makes more than up for the lower output. But in a single li-ion flashlight it runs less efficient initially because the overvoltage of the battery is just burnt up by the driver. Once the battery voltage goes down during drainage, the Nichia runs more efficient than the XP-G2.

The problem is very vain in nature: I like single-sided boards :bigsmile:

I usually prefer linear drivers, but many times I have gone with a fet just for aesthetics. Otherwise, yes, the uber-low Vf is a huge plus. If the high CRI version is as good as this one is, I’ll be replacing a lot of XP-G2’s in my lights.

edit: thanks for the correction Djozz. I see lower lumens at the same amperage and just think “less efficient”. The effect of the lower voltage on efficiency didn’t even register.

Well I looked up n10sivern's test numbers and the XP-G2 S4 2B drew 3.8A in the 1504, I assume that is at start with a full battery. That is 1170 lumen in my graph. The 219C gives off 1170 lumen at 4.7A, it will easily run more current than that so the output will be more than the XP-G2. But the 219C die is about 20% bigger, so it will never throw as well as the XP-G2 with the battery full. But that changes when the battery drains. Actually I did not measure the die size of the 219C, still have to try to dedome it, I just assume it is the same size as the 219B.

Thanks for the work, djozz! :beer:

Thanks for all the support, it makes this place what it is :-)

Now for some sad news: hot-dedome attempt failed. I have succesfully hot-dedomed Nichia 219's before, but with the succesful ones a thin thin film of silicone remained over the die. however, not with this one. Perhaps next attempt would work, but this will be my only attempt for a while, I'd rather leave the one remaining emitter I have alone.

I don't think I'm the only one that thinks this but your the man. The graph with all its lines is only to easy to read. You have chosen the colours well. The lower voltage of this led to me makes it more than worth looking at. The light still has really good output when most batteries have fallen on their face in single cell use. Thanks again for the outstanding work and invaluable information.

Awesome work djozz! Thanks for sharing it.

Can you see if the S4 bin XP-G2’s die is any bigger than usual?

I dedomed the XP-G2 S4 2B also (this one worked fine except for a small piece of silicone on one corner of the die) and made pictures of the two emitters under the stereo microscope at the exact same magnification, then Photoshopped the dies next to each other (I did not match the sizes, both leds are indeed the exact same size), the dies look the same size too (so is the S4 bigger than before? I don't know). I have to go to bed now, so no further measurements, but last thing I did was measuring the XP-G2 emitter with caliphers and I measure exactly 3.5mm (if we did not already know that, but I never measured it myself), so you can work out the real size of the dies from the picture below (good luck ;-) )

EDIT: Oh shoot, took out the ruler and I measured it all the same, I measure the XP-G2 die size at 1.48x1.48mm. Apparantly the 219C die is smaller than the 219B die :-) (and now for the succesful dedome, who can do it?)

I’ll gladly try a dedome once I get my dirty paws on one of these gems

Wow, nice photomicrograph! Worthy of a scientific journal. I always enjoy your reviews. And it looks like this emitter is going to find itself on many shopping lists.

Man you are a record H) thanks for the whole work, guys like you makes the life easy

But i have a question the Nichia leds have a very nice tint so why dedoming it as long as using them are not meant for throwing ?

Thank you djozz!
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