XB-D Trustfire Z8 vs a SK68 XR-E

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Chicken Drumstick
Last seen: 4 months 3 weeks ago
Joined: 08/27/2012 - 05:00
Posts: 2762
Location: UK
XB-D Trustfire Z8 vs a SK68 XR-E

Ok, I’ve just fitted a CREE XB-D to my Trustfire Z8. Smile

Bit of history, I was one of the few quite pleased with my stock Z8, although I found it a little too cool. On my old DMM it pull 1.82A with the XM-L in it. However I replaced it with a Nichia219, it now only pulled 0.98A (different DMM) and had clearly lost a number of lumens, but the CRI was brilliant and it worked ok.

Sadly while buggering about with some TIR optics I managed to break the dome off of the Nichia Sad Sad

As a cheap replacement I ordered the CREE XB-D Q5 3C from Int’l Outdoor:


It arrived yesterday, so I promptly fitted it. The Z8 is still running the stock driver, so is H-L-Strobe, dodgy memory and PWM on Low.

It’s now pulling 1.18A on an eFest IMR 14500.


-Really nice tint. It actually has to be one of the best CREE tints I’ve got.
-Very good CRI. I know this shouldn’t be close the Nichia, but I’ll be honest and say it doesn’t seem a whole heap different to the eye.
-Brighter than the Nichia, but maybe still lacking a bit.
-It focuses down to a round LED die image with a duller centre in a sort of ‘x’ shape. Defocus is slightly though and it’s almost a perfect even circle.

I thought I’d compare it to one of my SK68’s, so I picked the brightest of the ones I have. Running the same IMR efest 14500 this XR-E SK68 was pulling around 1.31A on my DMM.

Z8 XB-D on the left —- SK68 XR-E on the right:

On flood the SK68 is marginally brighter maybe, although it’s much cooler with much worse CRI. For close up stuff such as working on a computer or lighting something up to photograph the XB-D is rather nice.

Throw wise, they are more closely matched than I’d have thought. I personally like the round rather than square LED image. Although the XB-D does seem to focus down to a smaller size in the Z8. The SK68 just out throws it, but it’s not by much.

I’ll attempt to get some outdoor photos if I get chance.

Overall as a “quick fix” I’m quite impressed with the XB-D and it certainly hasn’t seemed a downgrade. It does seem to be being driven less hard than the SK68’s I have, so that may also explain why it’s a little down in lumens. But I’d certainly consider this LED for another build and the tint is just wonderful. Smile

djozz's picture
Last seen: 1 hour 27 min ago
Joined: 09/07/2012 - 17:04
Posts: 17891
Location: Amsterdam

very nice, I would not have thought that in throw the XB-D would compare that well to the XR-E. Thanks for sharing!

Last seen: 4 months 2 weeks ago
Joined: 07/13/2011 - 16:18
Posts: 3888
Location: Honeyland

XB-D is older than XP-E2 yet XP-E2 is only matching it's brightness performance per brightness bin.  In other words XB-D is a bright as XP-E2 and was actually released before XP-E2. Yes rest is different, different dome, different pads, size. However XM-L2, XP-G2 and XP-E2 can't be had at 80+CRI at 3C (or other "3" tints)


_the_'s picture
Last seen: 1 month 2 weeks ago
Joined: 07/08/2011 - 06:22
Posts: 3646
Location: Finland

Thanks for the heads up!

3C 80+ CRI is exactly what I need for some of my smaller zoomies. Ordered 4 of those..

Ps. I really like the Z8 flood with very smooth hotspot.