Earlier in the week I put the ZY-T08 back together with the driver circuit from my Lustefire 3XU2. I modified the driver to have pretty much the same output as the modified TR-3T6. I measured 6,4A at the emitter. I have not done any of my typical extreme indoor tests, simply because the de-domed emitter I put into it had the best tint I have ever seen from a de-domed emitter, and if its going to die, I want to say that I was able to enjoy it.. I can report that I have about 1hour runtime on the light, most of which have been on high and its still going strong. If it fails, ill report back..
The driver, or similar can be found on ebay, search "sst90 driver". Example. Its often rated at 7A. I have seen reports of 7-9A stock on this driver. But I have also seen some ebay sellers in the past say 5A. Either way, output seems to depend resistor..
Im not going to draw any conclusions, but so far it seems to be doing a good job.
Input current is around 4A on NCR18650B that have seen some use (3,93v resting) . Rough numbers:
4A*3,75V (guesstimated voltage at load)*2=30W
6,4A * vf around 4=25,6W
Efficiency around 85% on high..