Cree XP-G3, testing a S5 3A emitter

I take it that the off angle tint consistency has improved with the new phosphor technique?

Really nice test, djozz. I look forward to these. Lots of information herein.

Quote from above: “So for now, the ‘king of throw’ is still the ‘old type’ XP-G2 S4 2B, which unfortunately is not available anymore.”

Just FYI in case anyone wants this, V_O_B is selling these ‘king of throw’ on ebay - $7.95 mounted on copper sinkpad.

Thanks for sharing the test results djozz! Curious that the Nichia 219C tested so much lower than the XP-G2. I thought that they supposed to be really close in performance.

A D320 bin 70 CRI 219C would show about 13% better output numbers. Also, take into account the total wattage at a given output; the 219C has a much lower Vf.

Interesting. Where did you get them from?

Thank you djozz for the thorough test :beer: .

Lumitronics (leds.de). They are quite new, and there are not many colour leds with the 3535 footprint.

interesting!
Thanks

Thanks for the long awaited review djozz.
Do you think that this emitter should be my choice for running small triple/quad lights on 14500 cells? I’ve mostly even using XP-E2 (because I have 50 of them), but I need a change up.

These things are absolutely amazing when fully dedomed. I put one in a reflector light last night, and the lumens looked almost identical to the XPL next to it, but with a pure white hotspot 2/3 the size. I honestly would not trade the dedomed tint for anything I have seen yet dedomed. But 7-8 amps at max output? Holy…crap. YES! :partying_face:

Nice, have you posted your method for dedoming these?

No… He’s teasing us;) but he’s been graciously giving hints along the way.

Hi djozz

Very useful as always! :student:

Many thanks

Have you taken any lux measurements? As we have seen with the 219C, just because it is dedomed does not mean that the process will double the luminance like with the XP-G2.

So, de-domed properly, these should out-throw the old style XP-G2 S4 2B. Is that what you guys are saying? I’ve got a couple of the XP-G3 from the VOB group buy from Cutter. I would really like to know how to de-dome one of these. I’ve never had a XP-G2 S4 2B light. I’d really like to see what it’s like. :innocent:

+1

+1

You might try the method commonly used to dedome other LED’s with embedded phosphor: by using a razor.

Based on Djozz’s excellent data, in theory the G3 would be more intense than a G2 S4 until the die approached 1.7mm² die size. That’s assuming the G2 is 1.5mm² die size.

I haven’t scraped a G3 to measure the actual die size. Can anyone confirm what the G3 die actually is who has scraped the phosphor off to measure?

Just looking at it, I would say there’s no way it’s 1.7*1.7mm.

I am putting these dedomed emitters in M3XS-UT Javelots, and I will be posting the throw photos up by morning now that I have a good mix of LEDs for comparison all in the same hosts. It should be interesting to see the results against the G2, which will be compared in the beamshots.

EasyB, luminance may not double, no, but a dome is a magnification optic. Any optic which magnifies also decreases luminance. I will be writing more on the details later about these LEDs. So far, I am definitely impressed with it being dedomed in a reflector light, though.

Instead of a razor could one use a cnc machine and a very sharp bit to shave the dome down to a very exact height? Would this give the flat dome a nice and even finish? just a wild guess…