Wow! That is a lot of work. Thank you for sharing.
Just out of curiosity.. Which one do you prefer for biking.
To me the upper third frosted looks good as well as the lightly frosted. But preferences may wary :-)
Thanks gb. Amazing effort. Which lens do you prefer or is one better than another in different circumstances? For example does riding the trails need a different lens to riding on the street?
I really like that wide angle lens. I wonder if there is one for a 502B
That particular wide angle lens is unfor only avail in 39mm width. I’d need a 35mm…
Congratulations! Very good work 
thanks for sharing
Nice work Garry! I am also a fan of Glad Press n Seal stuff. Works great for me, and also diffuses into not a perfect circle but kind of a slight oval. I then like to orient that longer axis parallel with the ground in my vision so I get a wider throwy area and nice surrounding flood.
On my HP21 headlamp
How about a light frosting ontop of the wide lens?
Garry what pen did you use to write, it looks good. Also nice calligraphy.
I've only been on my bike 3 times in 2014 and none of those times was in the dark with a light. (And 2 of those times were slow gentle family rides.) I would expect a light that gives wide flood while still having good throw to cover most needs. MTBers generally also wear a throwy headlamp for looking ahead / around corners. That's not something I've tried yet.
I think that wide angle lens can be cut down. You could also experiment with magnifying lens sheet.
I thought about throwing in the Glad Press-n-seal too. Maybe in the future.
Sorry, I don't want to ruin my wide angle lens by trying frosting on it.
The pen used is my favorite - Pilot G2 Gel. I think that one is the 0.7 thickness. I've never been told I had good handwriting.
-Garry
Thanks for sharing this work garrybunk. I’ve only had time for a quick look. (I skimmed all of the text and briefly scrutinized each photo & mouseover.)
Useful info for me. I also rarely ride, but to me the wide angle lens looks like the best forward beam pattern. It’s too bad that it sacrifices some spill, but the column of light it sends forward on the ground seems to be unlike any of the others!
So the wide angle lens is smooth on the front and ridged on the back? And the mounting area around the edges is a uniform thickness which is less than the overall thickness of the ridges?
Nice work, Garry.
Correct on all accounts.
BTW-Looks like my photos are going to disappear again! I'm going to hit my PhotoBucket bandwidth limit very soon. Sorry. I'm going to have to look into another image hosting service I guess. At least you have the link to my gallery in the O.P.
-Garry
Try Google. Haven’t run into limitations yet for the free service.
Thanks for sharing Garry . Good job .
"...
Original Glass 49 15 91%
DX Glass 51 16 94%
Lightly Frosted 45 14 83%
Heavily Frosted 33 10 61%
DC Fix (Entire) 40 13 74%
DC Fix (Top 1/3) 48 15 89%
Wide Angle Lens 49 15 91% ..."
I especially like the percentages style of comparison .
I wish to see more of this .
Thanks. You know, I believe someone has tested DC Fix as having very little light loss. Not sure why I'm seeing so much loss in my test. Perhaps the light is cast so much to the side that it's not picked up in my ceiling bounce reading? Thoughts anyone?
-Garry
Yeah , I've heard about the supposedly small losses from DC-Fix , but I can't use it on my bike lights , as it definitely takes virtually all throw away . I need some throw when I'm going fast so that I don't outdrive my light .
For this reason , I only use DC-Fix on lights I will use for close up work .
i was going to say this too ....I've never tried press and seal glad wrap but I have some cheap sandwich bags that have small marks built into them and it makes the beam spread out just a bit .So you could orient the angle vertical or probably more usefully horizontal to spread the beam out . . Now i need to go get some press and seal ...
Maybe the reason you're seeing so much light loss is the meter is too far from the light .I thought dc fix was a lot less loss .. you may need to build a sphere:P
I use Glad Press n’ seal and it does what i want it to do.
Hmm . . . sounds like I need to test another method :) .
-Garry