And what about with your lux meter slightly pulled out?
The meter position will be relative, it will effect all the readings by a fixed percentage. It basically becomes part of the calibration.
That said I do not recommend using the meter position as part of the calibration as it is too hard to keep it consistent over the long term.
Adding a little electrical tape to the inside of the 1st bend would be a better way to fine tune the readings since that will not be effected by bumping the sphere.
That was the point I was trying to make earlier. It’s best to put the meter all the way in so that it’s consistent and then find some other way to adjust the output up or down to get the correct Lumen reading straight from the meter.
Also, the vast majority of my lights have a fairly decent fit through the centering ring holes. If I were going to be using those extra small diameter lights to do the calibration, I would probably rig up something simple to prevent that extra light from getting out.
Sorry if I sounded grumpy.
Thats about right… i got 3150 lumen @ turn on… and 3090 lumen… odf30 is a joke… sometimes turbo mode doesnt want to work… lumintop should have use spring tailcap… oh well…
I think it’s a pretty good light.
The tail cap lacks springyness. Just pull the tab up a little so the battery gets compressed. Then you should get turbo for about 1m30s or more. I might replace that tab for a regular spring and bypass it.
I got about 3050 lumen at 30s.
I don’t use it because it lacks a mode around 1000 lm and has the weird one click on and press/hold off. Also, I don’t like glued lights.
I can’t seem to find any 26650 boost driver light that meets my needs. I’m just waiting for Lexel to start selling his drivers.
My lights came today. I will give a report once I have some time to play. Thanks again Maukka
More lights arrived today. All the people on the list will have their sets sent out this week.
I also got my lights - very happy, thanks Maukka!
PPal sent! Thank you very much!
What carrier is delivering these in the U.S. ?
Not that it matters but VoB got his his really quick. Probably paid extra for the shipping. As far as who is delivering them in the states I have no clue. I would think usps will eventually end up delivering them.
They will get here when they get here.
I have been rushing to the mailbox everyday after work, nothing yet. I usually don’t to get excited about new lights but these, I feel like a 10 year old at Christmas. 
Got mine via USPS today. Thanks! Can’t wait to get calibrating. Thanks maukka!
For those who are antsy (I was), it wasn’t in my informed delivery app, just showed up.
Thanks, that tells me I don't need to check the front of my house for packages after USPS has delivered the regular mail.
It fit in the mailbox easily. And I’ve got a regular sized mailbox.
Those who received calibrate lights should post lumen. Thanks
Why?
It’s only relevant for that particular light.
The S2+ sample light in post #1 (1301) was 270 lm @ 30s.
My S2+ (1303) is 267.5 lm @ 30s
I think he means maukka lumens vs TA test tube lumems
I’ll post the difference once I get my light. I’m not expecting any big surprise, though. I’m just hoping to dial my lumen tube in to a tighter tolerance.
I can increase/decrease the lumens by tweaking the 2 discs by the sensor. Or I can add some transparent tape to decrease it a little more. We shall see.
I’m super happy so far. I plan to test with fresh off the charger batteries over a few days to make sure i’m getting the same readings. Used an eneloop fresh out of the package with a 17-10 stamped on it, and a 30q that’s been rested for a few weeks.
Originally, I calibrated my sphere using a few lights I thought were pretty good to go. A GE led nighthawk floodlight (residential ac model), and a few off the shelf lights from olight and nitecore.
I ended up with a rounded multiplier for my 17”, BaSO4 coated, paper mache and fiberglass sphere of 0.20, using a Dr Meter LX1330B.
Initial tests using the newly received calibrated lights gave me 0.1965 for the NW BLF348 and 0.2085 for the CW s2+.
I will likely extrapolate the new variable multiplier, using a formula, based on color temp for all my other lights. With fixed points at the 6420k and 4862k my test lights read.
This is super exciting.
Here’s what i’m using: