My first Q8 was fully accurate, temperature related… (but it measures Voltage 0.2V lower, than actually, and has an AR-layer on the lens, which btw. is not bad)
That’s why I was wondering when the second Q8 was +15°C off…. (this one on the other hand is accurate, when it comes to Voltage measurement)
The second one is also a little bit brighter, maybe because of this it also gets much hotter, and it has NO AR-layer.
I tweaked the temp cal on one Q8 to be dead on, then with the same firmware got results of +3C, -3C, others up to 10C give or take. Range can be +/- 12C or so it seems, so having two at 15C from each other is certainly possible.
Talked to DEL bout it and the variance in the MCU's and Schottky diode can cause this. From DEL it sounds like we would have been better keeping the R1/R2 resistors for better accuracy, as long as the resistors were 1% or better, 0.5% sounds like the way to go. The extra parasitic drain wouldn't have been that bad. I didn't realize the error variance was going to be so great like this. I've been very disappointed with this, depressed I'd call it -- just wish I saw this as a possibility. It probably can be improved by installing a good R1/R2 of 220K/47K and of course the firmware changed accordingly.
I spent a lot of time improving the calculations using the internal ref (non R1/R2) method all for nothing... Again, I'm very down about all this. I don't think a "better" Schottky diode would help - I also spent time on researching alternate parts.
Did you not get a PM? I got a message some two months ago. I eventually received a new switch assembly, at standard china mail speed (4+ weeks). Works great now.
I let The Miller know and he made a record of the problem.I made certain he knew about my issue.
After some time I received a PM from The Miller (with a CC to Thorfire). In that PM Thorfire was informed of what corrective action I needed and they were given my mailing address.
Some weeks later (about 5 weeks IIRC) I received an envelope in the mail. In it was a switch board complete with switch and led’s as well as a plastic/nylon tool for removing and replacing the switch button retaining ring.
If The Miller knew of the issue anyone had, I would have thought the same process should have happened.
Tom E can I get an update on my Q8. I hate to post here but you said the modifications were finished on 11/13-2017 and you just had testing to do. I have sent pms and emails but no response. I figured something got lost in the shuffle but I thought I should say something before it is lost permanently. My q8 was the one sent already in the grenade pouch and original q8 box. You received it on 11/11/17 via USPS padded envelope. I hope everything is well with you.
I am still loving this light, its become my favorite. No issues whatsoever.
Lights things up like crazy! Been showing it to couple people and they are super impressed