I’ve asked, will update.
PTFE/barium sulfate blend. Seems fairly standard.
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Someone contacted TKLamp directly about possibly getting two via the group buy, so this technically puts us at 9. I’m trying to see if that’s enough, if not then I might go in for ther 10th slot myself if that’s necessary to get it made.
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can’t wait to have this. very excited!
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I hope you have fun here, shawndumas!
In for one as well (so that makes 10?). Thanks!
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We have met the goal! Talking to Fara at the moment to find out how progress is looking on the development side.
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I’d like to know what kind of measurement variance can be expected from sources of different CCT, like 2700k and 7000k, or even 1800K on the low end. The data presented on the product website is too sparse. They make no accuracy claims.
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That’s the unknown here. I will say a good quality luxmeter will have built in compensation (either filter or correction firmware) for variances in CCT. The one I use Digi-sense 20250-00 does a good job with that, but not perfect.
I asked, will update when I get an answer.
Also, got an update on the datalogging capability. It seems that having it log to an SD card would have been more difficult and added more to the cost, so it’s likely going to have a USB interface for software on a computer to read. Seems like Windows/Mac would definitely be supported, and Linux may be, but if not, then I reached an agreement for the protocol to be documented so someone can write something for linux that interfaces with it if there’s no out of the box support, as well as just enabling more custom tooling to be built around it.
If anything, I maybe even prefer being able to directly log using a computer, my main worry was about unsupported software or software that is missing features we might want, but if the protocol is documented that becomes a lot better as we can just implement our own software for the data gathering if necessary.
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Update re. CCT sensitivity: Looks like it might read slightly higher for warmer LEDs, based on a higher reading for incandescents. From the sensor manufacturer:
I’m assuming a lot of the LEDs people here might be using might fall under “artificial sun light” if I take that as a neutral CCT and high CRI.
Hopefully there is some kind of calibration or mode selector according to CCT available, no matter if it has to be done manually on screen or somewhat automatic.
If anyone has lights of different CCTs measured using higher precision equipment it might be possible to build one.
UPDATE 20 Feb 2024:
The product page is now live to order the datalogging version, production will be confirmed once there are 10 orders. Still open for anyone else who wants to get in on the group buy.
The base price is $400, plus $39 shipping to NA/Europe. In addition, there will be a $10 rebate per tester (refunded to original payment method) if we reach 15 ordered in total, and $25 if we reach 20.
Thanks to everyone who signed up for making this project happen, I couldn’t have ordered 10 by myself 
Order placed. How long is the group buy open, and is there any way that you can report back with the total count so that we can know if any discount is coming? Thanks for organizing this.
I’ll ask how long now. Production will be confirmed at 10 orders but I’m assuming there will have to be a cut off date at some point.
I’ll definitely post updates when we hit the 10/15/20 targets.
Edit: Placed mine.
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Order placed. Thanks for organising the group buy!
So far, 6 people have paid for theirs out of the 10 needed.
Cutoff date for placing groupbuy orders is the 1st of march.
I was interested, but I am not able to place order it until 1st March (I think in april or may) due to financial issues… OK, then it’s DIY time 
Asked Fara, hopefully should be able to get that worked in.
We are now at 8 confirmed orders, 2 more to guarantee production.