Finally the XHP70.2 emerges!

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

Thanks djozz

So 5.5 amps should do the trick then being as 11 amps is what I have seen mostly what people use in 6v config.

btw this is not for a flashlight set up but automotive use, and will have proper fan assisted heatsink cooler.

There is a consideration: 11A (or 5,5A at 12V) is already very hard driven, the official maximum drive current is 4.8A at 6V. What we test over here does not include longterm effects, we simply do not care much about that because 1 year later a new better led appears and the old is forgotten or replaced. But it may be something to consider in what you are building. (or not :party: )

They are going to be main beam headlights so will only be on for very short periods… I will prob run them at less than 11A though maybe 8 or 9

I needed to confirm the 5.5A part so when I’m testing etc I had a figure to set myself as a max.

Thanks for your help.

Dave.

Just put a xhp70.2 p2 3b from kaidomain in my L6 with a TA driver running narsil from Lexel.

It pulls 18 amps at startup from a couple of liitokala 26650.

Holy shit! It gets hot about as fast as my S41 haha

Sadly i dont have any way to measure lumens, but from you other ppls test i guesstimate it should be over 8k otf lumens am i right?
It certainly looks like it :sunglasses:

I run my XHP70 at 12A 6V, you will definitely be fine at 5.5A 12V if you have a good cooler on it, like a mid/high end computer CPU cooler.
Remember to use good thermal paste (I recommend MX-4) and screw the PCB securely to the cooler in some day.
Nearly 100W of heat will need be dissipated.

Thanks Enderman.

Will be using 4 of these Redirect Notice

CSL8025MP

2 will be used for 2 XHP70.2 other 2 will be used for 2 CREE CXA 1850 arrays.

Looks good.

I installed an XHP70.2 N4 5700K on a maxtoch 32mm (mtnelectronics) in my chimera. Downsized the wires to 22 awg and used a few extra inches of wire to add a little extra resistance and eliminated one of the 22 awg jumpers on the tailboard. With 2s4p ncr18650b powering the TA srk driver from Lexel all I can say is “WOW!”, even looking at the beam on the white wall in the middle of the afternoon. I made the mistake of looking at the beam on the wall a little too long and had artifacts in my field of vision for several minutes. Not too fond of the yellowish corona but otherwise it’s a nice beam. I guess I need to cobble together a fixture to measure the output.

Looking forward to seeing the output after it gets really dark outside.

just sliced the dome of a xhp70.2, but found only 2 of the 4 led are turning on, not sure what went wrong. anyone with same experience?