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

Iā€™ve posted some Nichia NVSW219C 5000k LEDā€™s for sale. $5 each for less than 5, and $4.50 each for 5+, includes shipping.

Hell welight, I donā€™t know what else you could do to get people to buy those, itā€™s a screaming deal (particularly if youā€™re in the USA) buy it only looks like three after me have been sold?? Itā€™s not like we can get those 4000k 83CRI D280 ones anywhere elseā€¦

Appreciate your support. My comment was a general one in that most people trying to buy stuff from us have a MAJOR issue with our freight cost. it was just nice to see it explained that while we are not free shipping like the chinese vendors, we are not over the top expensive if you choose the right ship option

Cheers

Mark

The first decent dedome of a 219C.

Looks kinda similar to Djozz dedome :wink:

Is this with MEMā€™s method?

I wonder if the uneven surface will cause artifacts? maybe some 1500grit is in order

Maybe a close shave and polish might be a better option? :slight_smile:

MT-G2 dedome & polish method

Ok, Iā€™ll order some when I can afford it. :slight_smile:

Hereā€™s a beamshot comparing the dedomed Nichia NVSW219C @ 5.7A vs a dedomed XP-G2 S4 2B running direct drive. Both are focused for highest lux in 1504ā€™s. I got a reading of 326kcd from the dedomed Nichia vs 463kcd for the XP-G2. The colors are fairly accurate. The Nichia is on the left.

It feels like thereā€™s more to be had out of this LED, perhaps more dedoming attempts are due.

You have been busy! Nice work and comparison. The result looks suspiciously close to my sliced result of post #106: good tint shift but not the expected increase of die luminosity.

I'm not sure what's to blame. Could indeed be dedoming quality, but it may be caused by a difference between the Nichia and Cree phosfor recepies as well: the photon recycling causes a different spectrum that is more towards red and is thus measured lower. Or the Nichia phosfor mixture is saturated at a lower light intensity. What really happens in the different dies is easily beyond my expertise and may actually be extremely complicated

Let's hope it's just dedome quality and a succesful method pops up soon :-)

Iā€™m starting to get the hang of what tools to use and how to get the dome off these. Only screwed up 2, and 2 good ones now. One thing I notice is that these are just really ugly in pictures compared to real life. Youā€™ll be able to tell from the side profile picture that the top of the die is actually quite clean and flat, contrary to the head on picture which makes it look like there are chunks of silicone still on the die. Weird.

A better side on view showing how flat the surface is. Takes some precision razor work to slice the last stuck bits off.

I like the color of the one on the left. Is that the Nichia?

Yes it is. Iā€™ll edit the post, I should have had that bit of info in there.

A Nichia NVSW219C on the board with an XP-G2 S4 2B next to it, both dedomed.

Excellent work djozz and Dale! I gotta get some of this. I know I'm late to the party, been seeing things, just didn't get the whole picture till I read through this.

I've been frustrated with the de-domed XP-G2's for a long time now - hope we can find a good solution with good results to de-dome these.

Dale?

Iā€™m pretty sure Dale is DBcustom.

I put a stainless collar on the 1504 with the Nichia. With the collar it makes 383kcd. A 17.4% increase.

Tom got excited and missed that it was Henry doing the de-domes. lol

Yā€™all all know how easy it is on these forums to get discombobulated and post a comment slightly wrong, or a lot wrong, now donā€™t ya? :stuck_out_tongue:

Tom, I havenā€™t done any testing to speak of on the Nichia other than wire 4 of to a harness and run em ragged. :wink: