I’ve struggled to get consistent results in comparing the lenses, made more difficult by the fact that gain in brightness from lens improvement is very small compared to battery gain by upgrading to Samsung 40T. For example every time I changed lens and repeated measurement, I would get a different number from the last trial. If the variation error, for example +/- 20, is larger than the improvement, say +10, then it’s impossible to reliably prove anything.
After several attempts and adjustments, two changes brought success with consistent/repeatable results:
- Removing the bezel and compared lens without bezel in place. Comparison now done “live” without interruption, like changing slide in a projector.
- Testing at lower brightness (2 steps down from highest step) to remove auto temperature regulation from the equation. No more change in output during a test.
Raw numbers are meaningless in ceiling bounce tests; just want to show example of one set of numbers I’m dealing with.
No lens 247
Coated UCL 243 (~1.6% output loss)
Non-coated OEM 233 (~6% output loss)
Impressively the UCL lenses achieved ~98.4% of max brightness, and ~4% improvement over OEM non-coated lens. BTW, the 2 UCL lenses run very close, in 243-244 range, but UCL acrylic hit 244 max a few times, while UCL glass got 243 max.
This is best I could do with my amateur skill and “equipment” lol, so pls take with a grain of salt 
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