Cree XHP70 up to 4022 Lumens and XHP50 up to 2546 lumens - Multi-die leds.

The Shadow JM26 is a lot like an HD2010, but with a side e-switch. It has a big 28mm driver that is regulated. But it only made 900 lumens. The hot spot was gorgeous, very well defined, the reflector in it is unusual in that it is more bowl shaped that parabolic, but it’s perfectly made with no blemishes and no visible machining under the shiny mirror finish. I’m surprised that it is able to focus the array die so well, but it really does a nice job. The inside base of the reflector is about 2.5-3mm above the substrate of the die.

I take a tripod out to the same place every time. I do a quick leveling on it, then use the vertical line of the house to make sure it’s true. Then I zoom in and lock the adjustable head down with the oil drum in the center of focus. Once that’s done, I set the camera for a 2 second timed exposure, manual focus, infinity focus, 1/2 second exposure at f/5.6 and ISO1600 and take wide angle shot and zoomed in shot (24mm and 112mm), then run back in the house before the cold gets to me.

Laughable, I know, but I’ve had an issue with muscle spasms for 15 years that can be triggered by my core temperature falling. Not funny when your body is jacking you around. Bet it looks funny though. :stuck_out_tongue:

And Paul Harvey says “And now you know…the rest of the story!”

Oh, and I held my breath during the exposure so as to avoid the “smoke” (breath vapor)

Ah thanks, yes that sounds like it’s actually a fair bit out of focus perhaps? I think the quad dies really do like this type of setup best, or else the dreaded donut makes an appearance.

Of course I’m only joshing about the cold, man I’m the worst when it comes to heading out into the cold to take beam shots. I can always find an excuse to stay inside near a toasty test rig and scribble numbers onto graph paper instead. :slight_smile:
I’m sure we all really appreciate the effort you put into your beamshots and testing, it’s always a really good and varied shakedown of a new emitter.

Edit: Looking at the emitter pics of the XHP50 above, compared to the XHP70 it looks like the spacing between the dies is actually rather larger on the smaller emitter. Maybe that’s just an optical illusion because of the differences in the dome but those gaps look rather too large to my liking. I guess once they are dedomed we’ll see just how far appart those dies actually are. Could it be worse than the MK-R?

Oh I see! (I think, heh.) Does the spacing look worse larger on an absolute scale, or a relative one? To me it looks as if the inter-die spacing is the same distance for both emitters. It’s just that one emitter has much larger dies than the other, so the relative spacing appears worse on the smaller emitter. Or at least maybe. Eh?

Looking at the bond wires, the gap appears about twice as wide as a bond wire. So it’s really quite small then. The dome is making the die look big, it’s also magnifying the gap between em. We know the bond wires are very thin, so twice the width of a bond wire is what, about .2-.3mm?

You do realize the metric system is the tool of the devil, right? 0:) :smiley:

Ok then, it’s about a hair, I ain’t gonna say what kind o hair…

Horse hair?

It was a simpsons reference, Grandpa said: “The metric system is the tool of the devil, my car gets 40 rods to the hoghead and thats the way i likes it”
I’m shocked i can’t find a youtube video, but here is some more info:

https://www.physics.rutgers.edu/analyze/wiki/math1.html

Look what I found…

The solder wire above it is .031” Kester EP256, beside it is a capacitor from C1 of an FET board.

Someone put their XHP70 on the star backwards! :stuck_out_tongue:

Impressive, I think you missed your calling, Cree should be hiring you as an engineer

:stuck_out_tongue:

In a Tesla that should not be a problem :bigsmile:

nice

Nice!
Man, if only they could squeeze those dies just a little closer together! :stuck_out_tongue:

We just need a tiny cuttoff wheel on a dremmel, split the four dies carefully along the seams and sand them down a bit, then superglue them back together without the gap, who’s going to try it first? Dale? :party:

I was thinking JB Weld. I spoke to the guy in Honey-I-shrunk-the-kids and he’s pretty sure if we shrunk it on a horizontal plane it’d come out XM-L sized with XP-G sized dies crammed together snug. Think it’s worth a shot?

Apparently the pack-rat in me wouldn’t let me throw it away. It was in the depression under the handle of my 10 drawer kit box. I thought I’d tossed it so I wouldn’t be tempted to Play with a 12A blacklight…

Edit: Pretty compact little XP-L Quad isn’t it? :bigsmile:

Ok, so let me ask this… since you can plainly see that there are 4 plates to the substrate and since there are 4 connections on the bottom of the emitter to verify they are wired separately, is it not feasible that we could de-dome this array and then airwire it 4P to run on a single 18650 at 3V? A dedicated quad XM class as it were? If not airwire, then modify the star? If I can get my hands on some more of these I think I’m gonna try it…

In case y’all are wondering why it’s so fugly, I de-domed it hot, running at 12.15A. Then, when some phosphor pulled off one of the dies, I scraped the rest off while it was on and played with the UV mega light for a bit. :wink: Most of that was done looking at it through a welders lens while on at full power.

Haha now that would be quite a mod!
Very cool idea, not sure how feasible it is to fiddle with those tiny bond wires though. I remember there was a thread a while ago regarding repairing dead leds by reconnecting the burnt out bond wires. Not sure how successful any of that was though.

I think I can tell why we can’t do that.

The 4 contact points available after dedoming are the same as the 4 connections available on the bottom of the emitter, nothing extra is available by dedoming. That leaves 4 contact points unavailable to us, they are already connected in pairs. Where are they you ask? In DBCstm’s picture they are connecting the upper left and lower left emitter in series and the upper right and lower right emitter in series. I think it’s very reasonable to assume that this connection is happening directly under the dies.

I hadn’t paid much attention to the subject previously, but in the recommended 12v configuration in Cree’s datasheet the thermal pad is not isolated.