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

I hoped for illumn.com because I like 4000k leds way better than 5000k. (apart from doing output tests I like building flashlights )

oops, I didn’t even notice his were 5000k. 4500k is my preference. I can order some from Illumn then? Shoot me a PM if you’re interested.

Now at http://intl-outdoor.com/nichia-nvsw219ct-r800-d260-bare-led-p-909.html

Hi djozz, regarding your 219B in the graph I see it hitting 600 lumens around 2.7A.
In your older test of the 219B here it is maxed out just under 600 lumens around 4A.
Is that because older graph shows lumen values with reflector losses and the graph on in this thread is lumen value without reflector?
Just to be clear these were the same binned HCRI 219B?
Thanks for your awesome work!

I'm not absolutely sure of the binning of the 219B from the graph of the OP actually, the numbers are from a test together with the new Oslon square, at a later date than my first 219B test. I think that the led came from the same batch that I used in the first 219B test, from Kaidomain so uncertain, but I ordered one or two from intl-outdoor as well later.

The method indeed changed since my first 219B test, that first test uses a ceiling bounce method that measures the output from a reflector placed over the led, which can lead to (up to 20%?) light loss, this is on top of calibration inaccuracies that come with the ceiling bounce method (my calibration light -D40A- is much more throwy than the small OP-reflector that is used over the led that was being measured, and the ceiling bounce method is sensitive to source distance and incoming light angle, I expect the test-led to come out a bit too low compared to the calibration light). The later test that is used in the graph in the OP above (and all other tests since then) measures bare led lumens in an integrating sphere.

Any idea if they are going to come out with 90 CRI 219C?

I’m really liking the current batch of 83 CRI 219C. I’ve installed 10 of them in various lights over the last few months. Beautiful tint. Nice beam pattern in zoomies. Low forward voltage makes for easy regulation especially in small 1x14500 EDC lights, etc.

Just last night I swapped the XPL HI emitters in one of my DQG Tiny III triples with 219C. Not bad. Though with a 3.8 amp 10x7135 driver at 100% power the triple 219C doesn’t throw as well as my other DQG equipped with triple XPL HI and a FET emitter…. running at 30% power.

Any good sources for the 4000K version of this LED? I like the 5000K, but would like to see the other as well… I found the Osram SSL’s on Mouser in 4000K, but cannot seem to locate these anywhere in anything other than 5000K

I haven’t seen any 4000K 219C but there is 4000K 219B V1 HCRI at Illumn.com here
The beamshots I’ve seen of the HDS lights with these 4000K HCRI 219B look really good.

Thanks for the great test, I need to get more familiar with Nichia emitters, and the graph made things much clearer.

Thanks for the explanation. I’ll keep in mind that your current tests are bare LED lumens.

I got my 219C 4000K's at Cutter, here: http://www.cutter.com.au/proddetail.php?prod=cut2744 - good price except for the shipping.

You should add a bunch of other emitters like the XPL and XML, need moar data!!!

Check his signature block at the bottom…. Djozz is a very prolific tester….

Hint: It says DJOZZ Tests in blue…

Camo5 - please read this opening post thoroughly: https://budgetlightforum.com/t/-/23020, report back Smile. You will (may) find buried in there a whole section dedicated to djozz's tests, all the thread links - I'm guessing it's bout 1/4 the way into it.

The linked thread's OP is an incredible amount of work to put together and does a great job summarizing things.

For some reason I had been having a very hard time finding this data. thanks!!

just added another one: Nichia 219B V1 4000K 93CRI :party:

So……in a light with one cell only it’s probably best to use this new Nichia Led, due to the low Vf (3,5V @ 6A) because with one cell the XP G2 S4 would probably reach no more then 4A @ 3,9V……?

Grtz
Nico

Hi djozz,

I’ve just found this picture and it could be the answer to a question that was bugging me for a while. Assuming this is a XP-G2 on the right:
Are there some revisions of the XP-G2 with a different number of “dots” at the die? I’ve swapped some Latticebright with XP-G2 in those violet AA Zoomies (“Ultrafire Q5” or SK72XPE/SK72) and the older one of the XP-G2 has rows of 4/5 dots. The one I’ve just recently bought from Fasttech has more dots per row (6/7) and they are less noticeable, what is a good thing when the light is focused. Another difference is the lack of the small “+” sign on top beside the dome at the newer XP-G2. I was afraid they are fake, but the colour of the base and other characteristics match the known CREE’s I have. Brightness is also on the same level.

I’m wondering if I should use 2 or 3 of this nichias for a mountainbike-helmet-light with a LD-2(M) driver set to 6A. Is it safe to use them constantly for 20 minutes on 2 or 3 amps, if well cooled?
I red that they survive much higher currents for seconds, but has any of you tried them with higher currents for a longer time?

The test in the OP was on a DTP copper board. Assuming such boards, my gut feeling tells me if they survive 10 amps for a short period without damage, they will survive 3 amps, which is well below its maximum output, without problems for a prolonged period.