Continuing on this Astrolux FT03 (69.5 mm head diam) --
Ok, following Jared's lead, this de-lens procedure didn't go clean but was successful. I can verify the lens is glass and can crack:
I was able to remove the pieces and keep the die and wires untouched. These are the tools I used in the surgery:
The chards - yes, AR coated:
Didn't want to take chances here so just used compressed air to blow it clean using Gust Easy Duster, this stuff works great in reflectors too! I believe the marks are fins scratches, I think they were there originally:
Glamour shots of the LED in action, moon level:
So what were the results of de-lensing? Well, better than any of my SBT90.2 de-lensing jobs. Though it's only one sample, I see an 11.7% bump in throw, and 8.3% bump in lumens:
On same Black LK 5000 cell as before, now at 4.17V: 571 kcd, 1651 lumens at start
Repeating the test after fully charging the cell to 4.20V: 571 kcd, 1627 lumens at start
That's a definite decent bump.
Little more work on focus centering, tightening up the bezel: 581 kcd (1524 meters)
Lumens run: 1621 @start, 1570 at 10s, 1545 at 30s, 1521 at 1 min, 1485 at 2 mins
It was pretty warm at 2 mins but still cool enough to hold (no fan, in foam for the PVC lightbox)
Oh yea, can confirm the hot spot corona area looks cleaner after the de-lensing. Before there were reflections from the gold trimming.