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 :-)
I’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. You’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.
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.
Actually I thought I was staying with the tone of the thread, as earlier. You were the first to post results in a real light build/mod, so I thought, and went thru hoops to get the 219C early on. I know djozz, of course, did the incredible testing and presentation - again, phenomenal effort!
I ended up ordering a few from Cutter, because I saw other LED's of interest you don't find at MtnE or IOS: XM-L2 U4 1A and XM-L2 U2 3D. The AUS dollar prices are a bit scary, but once you see the PP transaction with the currency conversion to USD, not too bad, in AUS dollars (total US: $62.83). I should have gone over $100 AUS though (stupid me), to get the free shipping...
The dedomed emitter really has a lot more throw but a not so nice tint.
I compared it with a BLF A6 with 5A tint. Both have nearly the same reflector so they are about the same regarding throw.
In the A6 I have to use IMR cells to get the maximum from the emitter but with the 219C I can use standard high capacity cells.
I really like the 5A tint so the 219Cs are a little bit to cold for me. They are around 5000k.
But this are first time impressions. I will see how I like this emitter. I have a few lights where I want to try this emitter. One small AA light, one small AAA light and also in a triple with a 18500 battery.
Thank you for your impressions finges. I like 5A tints too, but my wife is very partial to cool tints. I'm hoping this emitter may be a happy medium for us as I like the 219B cooler tint.
^ I think it will shift at lower current if heat sinking isn't as good as your set up. I put a 219C in a TN31 a couple nights ago. I did a decent job of installing it, but could have done a better job. I used a MaxToch DTP MCPCB that was just big enough diameter to clear the reflector base. When I went up through the modes it dramatically shifted and dimmed some on the highest mode. When I went directly from standby to the highest mode, it would start out strong and properly tinted and then shift and dim smoothly to a more purple color. When I would switch back to the next mode down, the tint would smoothly return to normal.
The highest mode on my TN31 is probably somewhere in 6 to 7 amps territory. I didn't measure at the time.