Thanks for the suppot everyone. This review has certainly garnered some attention ... looks like there is still a lot of interest in Fenix models!
Do CR123a cells rattle at all in the Fenix TK12 since it can also accept 18650? The Olight M20 comes with a battery magazine to eliminate the rattle.
Actually, I found the rattle to be fairly minimal. It is there on all protected 18650-compatible lights (unless you use a carrier), but it seems less noticeable to me than typical on my TK12 sample.
But I must ask the obvious question - WHY DON'T YOU HAVE THE DEVICE TO MEASURE LUMENS???? Goodness, you are like Einstein with this stuff. You truly seem to know what you're doing!
Because a true calibrated one costs well over $1000 (some significantly more). :laughing:
There's also the issue of maintaining calibration, adjusting for different size bezels (and bezel materials), etc. Frankly, that would be best suited for someone in a photonics lab where they had service contracts with the supplier and a regular working relationship. It also takes some time to become familiar with the ins and outs of any particular model, to understand its limitations.
I certainly know the limitations of my milk carton
... which is why I don't report estimated lumens from it. But I do keep my little setup reasonably consistent over time by re-comparing older lights on a regular basis, so the relative comparisons hold.
That being said, there are a fair number of measured lumen estimates for a common lights out there now .. when I get a chance, I'll do a comparison to see how they compare to my samples in my lightbox. You never know, there may be a fairly good mathematical relationship between my box and a proper sphere (but I wouldn't hold your breadth
). I'll take a look and let you know ...