I got mine just now.
I’m also surprised by the high readings compared to the JoshK sphere.
I have a Convoy S2+ with QLITE 3A driver and xml2 CW:
JoshK 700
TA tube 1350
On the Road M3 CW: .69
JoshK 862
TA tube 1240 (4v)
Convoy C8 xml2 CW: .65
JoshK 845
TA tube 1310
DQG Tiny 7x 2500lm:
High- .65
JoshK 855
TA tube 1310
Turbo- .64
JoshK 2120
TA tube 3300
These are just quick tests with some batteries at 4v or so. I won’t be able to do more accurate measurements with fully charged cells until tomorrow.
I think the general consensus is that it is indeed reading high.
I tried covering the reflective tape on the spacer ring with black cloth, all I had at the moment, and readings seemed to drop back down to a little above the JoshK sphere. Maybe painting the silver side with flat black and flipping the discs will get the readings in line. (Maybe, requires more thought)
I was a bit skeptical of the JoshK sphere because after measuring lots of lights with it, the readings always seemed a little on the low side. Maybe once you take into account losses in reflectors and lenses maybe it IS accurate?
Anyway, all this will have to wait till later for me.
(NOTE, My JoshK sphere numbers are from a past session. I was comparing that to today’s measurements in the TA tube.
So not a direct comparison. I’ll get both spheres set up tomorrow so I can do back to back tests)