Ya, I'm a little disappointed too. As mentioned my sphere is not perfectly calibrated for this function, but they are going to be close with this emitter. I tested this in a light too for lux, and also did a visual side by side, which had the XML2 as the winner as well.
In ONE test I was able to squeak out slightly higher lux with the XHP35, but it was nothing major, and the reflectors were slightly different.
Yes, as fart as lumen output I would still expect this emitter to exceed an XML2 by a slight margin ( 200-400 lumens).
If I can get my hands on a couple of the very top bin high density I would be willing to take another swing at it.
Success! I fixed up the LD-2 like Neven said, put an 180KOhm sense resistor on it… mounted it to a large copper disc that then fit in my Maxtoch that came with an SST-50. (It’s unbranded, I’ll have to look up the model)
Running 4 Sanyo 18500 flat top lap pulls it does …
0.02A for 80.04 lumens
0.48A for 648.6 lumens
2.39A for 2018.25 lumens.
This is with the XHP-35. I messed up and went by the bond wires reflowing the emitter. BUZZ! Wrong answer!+ On this one, the bond wires go to the side, you have to go by the anode mark on the pads on the bottom of the LED+. I shorted it the first time, couldn’t figure it out so I searched the datasheet then double checked the physical emitter and sure enough, the first time I put the pads across the Noctigon.
Works, tickled to death, but have the 3 modes and I put moon components on it. Have a feeling there’s something I’ve forgotten…
Just got lux readings, mind you I didn’t bother to charge the little 18500’s first….
331.75Kcd for 1151.96M throw, and I haven’t even fine tuned the focus! This reflector has a wide base, I’m using a 20mm Noctigon at the moment, so I can’t get the reflector to sit down on the mcpcb like the HI series seems to prefer. I’ve got a ring showing from the thickness of the reflector at the emitter opening, but all in all it’s pretty amazing for this kind of die! It acts like a much smaller die surface actually. I’m impressed where I was expecting to be disappointed.
I didn’t take pics along the way or anything, went out of town today and came home to find the components I needed to modify the LD-2 had arrived in the mail, jumped on it and got it done after figuring out how to re-flow this odd emitter.
Remember DO NOT GO BY THE BOND WIRES! Reflow it according to the anode mark on the base. (Actually the thermal pad has a triangular cut out on the anode side)
I pulled the 20mm Noctigon and used a 32mm Noctigon soldered to a copper disc of the same thickness. So now the HI sits on 1/4” of copper that fills the pill of the light. Took a little trial and error to get the nice hot spot back but in the end I got it. And the base of the reflector sits higher than I would have figured, with this reflector anyway.
This 5000K is a nice white with a hint of the warm side. Crazy that the hot spot is so unified, no sign of it being 4 dies whatsoever.
LOL well I have to say that's a little embarrassing. It may well be that I am further out of calibration than I though when using the bare emitter on a slug.
Althought the lux testing I did had nothing to do with this. I still got nearly identical from the de-domed XML2 U4 as I did from the XHP-35
Dale are you using a sphere or one of the light pipes? Did you have to make any adjustment to your divide by for this test?
It’s easy to know what twice the lumens is going to look like. Take a second identical light, point it at the same spot and turn it on. To me, it’s never an “OMG” difference, but it is a difference. It is easy to have too high of an expectation and if that is the case, it is easy to be dissappointed. Nevertheless, the XP35 will be a lot brighter, go for it!
I know that second identical light test sounds obvious, but how many have never thought of doing that?
i paused my MM18 review and try to test my xhp35 in my lightbox at different amps…
since i have no adjustable power supply i think i try to DD it with different length and thickness cables
my setup seems to read too high i am afraid ( a 1000 lumen Fenix gets around 1200 in there)
a quick test of the xhp35 showed near 3k Lm @2.5 A
(–20% = 2400 Lm which is still good)
Measuring a mule is ALWAYS going to be much different than measuring a thoroughbred.
The reflector collimating output makes all the difference in the world in how the sphere or lightbox reads the result.
I use a light pipe as built and calibrated by manxbuggy1 and rdrfronty. They used 20 something ANSI lights to determine the multiplier, which for me is .345 x the meter reading. If I have to figure anything and shift or make adjustments, then the game is over and they’ve already turned the lights off cause that ain’t happening!
Yes, these measurements are in a built light, I should have gotten beam shots last night but was exhausted after a very long and hot day out and about.
PS: Let me also add that holding a Couri D01 reflector over this emitter gives spectacular results with an even tighter hot spot and very smooth spill.
I was hoping the LED would do better… :_(
