You got the extra diffuser discs from TA and dropped your readings down by 32, right? So you should be “calibrated” to about plus or minus 5. I call it calibrated. I’m hoping Maukka’s test light can narrow it down to an even smaller variance. Maybe plus or minus 2%.
No, mine is self built tube using a zebra light and a few other lights to calibrate that should have been close. I just don’t know how close yet.
Ah, okay. I thought you had a TA Tube. 
I have enough lights coming in for at least 40 sets. It may take some weeks though.
About ±2% is what I would rate my lights at considering all the variables such as (ambient) temperature, battery differences, repeatability of measurements, calibration accuracy. Never saw a difference of more than 0.5% between measuring sessions of the same light.
All the S2+ were measured with a Samsung 30Q on the very stable mid mode (2/3) and the BLF348 with an Eneloop AAA.
Btw, the output difference between the highest and lowest performing Convoy S2+ from a similar set of 20 was 12%.
I will send CRI measurement data as a text file to all who ordered a set. It includes the spectral (SPD) information and you can open the file in Babelcolor CT&A software to visualize data (CQS, CRI2012) that is not shown in the CRI measurement screenshot I also sent. The software is not free, but it can be used for this purpose when a measurement instrument is not needed.
I also recommend browsing through the help file it comes with. It covers many aspects of color rendering. You can also download the PDF separately here.
That’s interesting. Lets assume all that is from the emitter and not other factors. Each of Cree’s bin numbers go up in 7% steps, but they don’t say their tolerance is plus or minus 3.5. They go with a much wider plus or minus 7 which overlaps half of the bin on either side of it.
I think they give this wider tolerance just to account for how other people measure it and the measuring conditions, temperature, etc… It saves their butt as 12% is just barely within their 14% tolerance. 
There is other varying parameters too, but someone has to measure them to know how large they are. Two examples that are simple to test if someone takes the trouble to do that:
-take 10 pieces of 7135 chips and measure the current they put out.
-take 10 S2+ reflectors and measure the relative efficiency.
This can all add to the variance in output of these S2+ lights
Sets 1-9 shipped. Got some more BLF348s today so more will follow soon. The new batch has a 219C but still seems to measure above R9080 albeit somewhat greener than the 219B as expected. Doesn’t affect calibration.
Received Maukka’s email with the test reports. Getting a S2+ with 6252k and practically perfect non tinted DUV of –0.0002 so I will have a reference of what pure CW looks like. The other is 5053k and DUV of –0.0045 so I can see how rosy/magenta that might look. Excited to receive them!
maukka I see in the OP that you mentioned the possibility of tracking for an extra 30-40 euros. Will the options with tracking be significantly faster than the 7-12 days option?
If you just need the package as fast as possible, an express letter would be the fastest. It doesn’t have tracking but it has an estimated shipping time of 4-6 days. The cost is 14 euros more so total 78 euros.
A normal package with tracking to USA costs 34 euros more (98 euros total) and takes 6-8 days.
EMS would be 45 euros more (109 euros total) and takes 4 days.
I also got my email and had the same thought process. My numbers are different than yours of course, but I’m really looking forward to seeing a beam with my own eyes and comparing my subjective ideas of what that beam looks like to the objective numbers representing it. And that’s not to even mention how useful these will be for calibrating our homemade measuring devices. This is awesome, and I can’t thank Maukka enough for doing this for us.
Payment and other info is sent.
We should be good to go!
Thank You! 
Majority of the 2nd batch shipped. Ran out of BLF348 so Billy X has to wait til next week, sorry.
Interested in the set, whenever they are available. Thanks, maukka! Not sure how I missed this originally, so thanks to Adventure Sport Flashlights for mentioning it on YouTube also.
I guess I’m too late to get some sent next week if I order? I’m leaving for three months vacation next weekend, I can’t have uncollected packets in the mail, they’ll just bounce back.
Probably can’t send before then, but I can hold your package until you return home and send it then. It only takes a couple of days to arrive in Sweden.
Cool, thanks. I think I’ll just have them sent to someone else instead.
A few quick questions if I may though… The lights that you are calibrating and sending, the modes they are calibrated on, are they PWM modes or constant current? Also, how does light measurement with spheres and tubes respond to PWM modes compared to a constant current mode?