XHP70.2 dedoming pictures and VIDEO added

Nice work Zozz, very clean… :wink:

Thank you! The idea came from you;)

I think someone else suggested I try it, to remove the aura, someone that is no longer logging in and hasn’t in a while… but it works, all the flip chip technology emitters benefit from the slice and dice method. (I call it that due to the horizontal slice to remove the dome and the vertical dicing action to remove the excess phosphor)

You do it well though. :slight_smile: Meticulous in the detail department. :smiley:

Thank you for sharing, Amazing skills! :+1: What happens if you break the bond wires on the edge? Does it affect the led in any way? Will the led still work? less output? I don’t think I have brain surgeon hands that some of you were gifted with :frowning:

Did you clean the silicone afterwards? If so what did you use?

Awesome… thanks for sharing the process! Now to work up the courage to try this on a ~$20 LED!

Here’s a thought… what if you could make a cement mixture to surround the emitting area similar to a White Flat?

Scalping XHP70.2 version of NW is an average idea. I convinced myself. This is the version from Thrunite TC20. It’s getting yellow. I’ll take measurements later.

Thanks!
I don’t know the long term affect of the broken bond wire but the 2 I broke work fine at 100mA. They aren’t putted in a light yet so I didn’t tested at higher currents. I just blowed the led with compressed air. didn’t used any cleaning material.

Komeko:
Did you removed all the silicone from the dies top? It seems like that.
I didn’t removed all. I want to see how your turns out ! :wink:

Hmm …. I played with a knife, long and patiently :slight_smile:
Now I want to scrape all the yellow, but it will probably be the diode’s death.

If you remove the yellow phosphor from diodes top they will turn blue.

It can only gather some of that yellow layer?

Nice clean slices. :+1:

The way I do mine is I just take small slices with an exacto knife until the silicone is very thin. As long as the remaining silicone is as thin as possible I don’t think the surface smoothness really matters. With no bond wires to cut it is pretty hard to mess it up. So IMO there is no reason not to slice it. Then again all my lights’ LEDs are domeless (except my headlamp).

This LED sliced is definitely a potent combination of output and throw!

Thanks for the lesson Zozz. :beer:

Hey ZozzV6 did you get a chance to measure CD. of the slice and “dice”?

With dome 226125 cd
Sliced only 355500 cd
Sliced and diced ………?

My MF02 w/xhp70.2 (sliced and diced) lexel’s driver @ 8amps only did 298,XXX CD measured at 9 meters. But my variables of measuring might differ a lot from yours.

Very clean & precisely done ZozzV6!! Thank you for sharing the process & supporting pictures!!! . :+1:

This is very nice Mr. ZozzV6. May I know where you buy your metal pcb for led from? Thank you.

You only can remove fully from the edges. You don’t on the dies top. You need to keep a few tenth of mm silicone on them. That yellow phosphor makes white color of beam from a blue led under it. All white leds are blue under.

Redlyne22:
No I haven’t measured cd yet. Maybe tonight. I used to measure big lights at 5, 10, 15, 20 or like GT even 25m distances. This should be good at 15 and 20m. Smaller distance can read lower numbers.

Teacher:
Thank you!

clientequator:
I bought them from fasttech.com but those are 25mm MCPCB’s

It was MEM that talked me into trying the slice and dice, back when the XP-G3 first came out… remembered that last night. :wink:

OMG! Looking back through some pictures I found where I sliced my first quad die emitter back in April of 2015! It was a Quad XHP-50 Lucky Sun D80 build… :smiley:




I had two cool white and two warm white on hand, so I mixed the tint. Worked out pretty well and had an interesting look when off too! lol

It would get hot on two 18350’s, if I used 2 18650’s it would get blistering hot within about 15 seconds! Made something over 6000 lumens with the big cells as I recall. Don’t really remember the lumens on the small cells. The light is not longer assembled but I do have the copper disc with the 4 XHP-50’s on it still…

It wasn’t until after the XP-G3 flip chip technology came out that I started dicing the additional phosphor off the substrate. :wink:

Nice job!