Thanks for another great set of numbers, on a well-known light :-)
maukka - I love these CRI and color temp tint charts you’ve been doing. I would like to see measurements on more neutral white lights and also cool white lights, just to see how they compare. Maybe you can compile the charts into some kind of database that people can look up.
Thanks for the informative review! Just got mine a few days ago too, and I’m very impressed. Looking forward to trying a spring bypass (it’ll be my first - might practice on a cheaper light first…)
Thanks for a very excellent review
I will compile all the measurements in to tables and graphs at some point.
Here’s the tint graphs for Eagletac D25LC2 Nichia and Zebralight H600Fd III that are neutral:
And a couple more lights in the same graph:
I understand most of it, but just what does D50 - D55 mean? - Duh… 
Love your posts! - Thank you!
-Chuck
Thank you. - Looks like I have a lot to learn 
-Chuck
Impressive testing!
Can you tell which instrument you used for color measurements?
Sorry, forgot to add information about the measurement devices used.
For spectral information and CRI calculations I have an X-rite i1Pro spectrophotometer with HCFR for the plot and ArgyllCMS spotread.exe for the data. For runtime tests I use spotread.exe with a custom script and a i1Display Pro because it doesn’t require calibration every 30 minutes like the i1Pro.
Thanks, i1Display Pro seems to be affordable, found it at 200$.
I guess you just shine the light into its diffuser, from a distance?
Exactly. The i1Display Pro is a colorimeter, ie it has three light meters with filters inside. It is not as accurate as a true spectrophotometer but for output testing it is fine. Although if you don’t need a colorimeter for monitor calibration but just for runtime or lux measurements, I would probably just get a loggin lux meter like Extech HD450 that is comparable in price but easier to use (no 3rd party software required). But then again, with the right software the i1Dispay Pro can roughly estimate color temperature too.
Oh we just found BLF-selfbuilt 
Thanks for this review man.
Something for you, Djozz ? are you reading this?
More info on runtimes and temperature at the end of the first post.
Excellent testing info. Thanks.
I updated the beamshot and spill cie graphs with more accurate measurements and differentiated between the hotspot corona and the outermost spill corona.
With an updated integrated sphere (20 cm styrofoam sphere many people seem to be using) I measured 1076 lumens out of the S1. This is a 14 % difference to the earlier measurement of 945 lumens where I used a styrofoam box. Same battery (Eagtac 3500 mAh) was used.
With less bright lights in my other reviews the difference is only about 3 % across the board, with some exceptions on some really floody lights (DQG Fairy). This is mostly due to similar beam profile to the Fenix E05 AAA that I use to calibrate my readings. I will update all the tables after some more experimenting. I also got a 30 and 40 cm spheres to test.
Added color rendering information to the OP. See explanation here: CRI vs. alternatives with measurement examples
Tried the 30 cm styrofoam ball and got some more measured lumens, 1095 to be exact. This is 1,7 % higher than with the 20 cm sphere.
Some comparisons with different integrating spheres I’ve tried.
The 30 cm sphere has a sanded (1200 grit paper) inner surface. On both spheres the measurement is done on the surface. Thanks to djozz for the idea here Integrating sphere #4 (the fast and cheap one)
In my sphere the flashlights rests on top of a transparent plastic sheet level with the inner surface.
