Finally the XHP70.2 emerges!

Here’s a shot with the camera settings more normal.

The dark center is harder you see, but once you start moving the beam around your eyes pick up on it.

This donut hole is only related to the height of the reflector. If its good focussed and centered, there will be no hole.
You will have this hole on single-die emitters too, if the LED sits too deep in the reflector.

Thanks Jason! I can see it slightly, but it’s definitely something I can deal with. I’m going to finally breakdown and get an L6. It’s starting again…

So the donut hole is only a slight intensity drop towards the center of the hotspot, and to be expected because the quad die of the XHP50.2 is still not perfectly uniform. But it is nothing compared to the old XHP50 and even acceptable on a white wall.

I recently built an xhp50 C8 and can say that the donut hole in that is a whole order of magnitude worse. Complete blackness in the middle.

You would need a “not so good” focus to minimize the darker center. IE, bigger corona and less max lux. The pics I showed above have the reflector height adjusted for almost max lux and throw with only a slight difference in height between them.

If I move the reflector out more, I can make the dark center go away. The corona gets bigger and the lux levels drop down, throw is decreased, but the hotspot looks much smoother. So you just have to choose which you prefer. Max throw or a smooth hotspot. I went back to a xhp70 and adjusted my reflector to give a smoother hotspot. I lose a little distance, but am happier.

I think I’m gonna try the 70.2 soon just to try it out.

I have a XHP50 C8 as well that I built years back. Right when the XHPs first where released I suppose. Surprisingly, the OP reflector didn’t give the best beam. I have an SMO installed that I think came from FT. I know there are different versions out there, and I’d have to crack it open to check which one it is, but it works fairly well. There is a slight crosshair dark spot but it kinda serves a purpose in my application… It’s on my 12ga pump with a homemade tape switch that’s switching a FET installed in the tailcap. It’s running direct drive off purple efest 18350s.

It sounds like yours is better focused then mine since mine is just a hole in the middle but no crosshair. I tried another centering ring and didn’t care for the crosshair so I settled on the hole.

I most likely could have improved things a bit more by playing with the focus but it was just a spare parts light that I was tossing together, I highly doubt I would ever use it anyways so I didn’t bother.

I do so want to put an xhp35 in a C8 with a boost driver though, just a matter of getting the driver and firmware for the new designs to work.

I’ll see if I can’t get some beamshots and pics posted of that light. Probably start a new thread topic and that’ll capture some of my more unique/scratch builds. I’ll post a link here when I get there…

If I wanted to swap the N4 1A XHP70 with a P4 1C XHP70.2 in my L6 using the stock driver (no modifications), would that work without messing up the 70.2? I keep hearing about resistor mods and I’m a little confused if that’s something that has to be done on the stock L6 driver.

The 70.2 will work perfectly fine with a stock L6 driver. This is because the L6 driver regulates current to the LED. Other drivers commonly used around here are FET drivers. These are very low resistance circuits that allow the LED to be driven as hard as the batteries can push them. The problem arises with the new LEDs because their voltages are lower and the batteries then deliver way too much amperage in this type of setup.

Perfect! Thanks for the info! Time to order my first 70.2. Thank you.

Abs where did you find a P4 1C XHP70.2?

Got any links? Thanks

Just bit the bullet and ordered a XHP70.2 P4 1A 6500K from https://m.fasttech.com/p/7908401
. The question I have is, the copper star it comes on, is it good enough? I’m not sure if it’s a direct thermal path or not. Has anyone ordered LEDs on copper stars like this before from FastTech? I’m going to use this led in a stock L6 as an emitter swap. Thanks!

You bit the P2 bullet…

That is a P2 not P4.

I believe those stars are DTP. I have some bare XHP70 stars from FT and they are DTP, they look the same as what that emitter comes with.

Whoops. I ment P2, not sure why the hell I put P4, lol.

Anyhow thanks for the reply on the question about the copper stars design.

Just a quick question please.

Do I just halve the amps on a 12v version to get the same output? Nobody has tested a 12v yet as far as I can see.

Thanks

Dave.

Yes indeed, I have not seen that tested either but everything about how the led is constructed predicts that it works that way