Hi guys. My D4, which I carry every day, already has a slightly scratched glass. Recently, I have an FWAA with sapphire glass in my pocket (that is, one that apparently does not scratch) and for now I am satisfied (but I know that the diameter of the head may matter). I decided to order some for my D4 instead of the standard ar coated. I bought them on AE here (non affiliate link). Below are some measurements from my three D4s, no glass, ar glass, and sapphire crystal glass.
flashlight | no lens | ar lens | sapphire lens |
1. D4 - 4x 319a 3500k, 10622, 5A | 1624 | 1526 | 1489 |
1. D4 - 4x 319a 3500k, 10622, 4/7 | 321 | 297 | 288 |
2. D4 - 4x xpl hi 5000k, 10623, DD | 2836 | 2660 | 2552 |
2. D4 - 4x xpl hi 5000k, 10623, 350mA | 112 | 105 | 100 |
3. D4 - sliced lh351d 2x2700k + 2x5000k, 10623, DD | 3370 | 3052 | 2973 |
3. D4 - sliced lh351d 2x2700k + 2x5000k, 10623, 350mA | 146 | 130 | 124 |
Only the first one has Anduril. 4/7 is the fourth mode in stepped ramp. The other two have D4 UI v2. 350mA is after tightening the battery tail.
Note. Above measurements are illustrative only, they are not intended to show the maximum performance of these flashlights. They all had different batteries, partially discharged. I also don't have professional measuring equipment, I use my own shoebox with ceilingbounce app.
I hope someone will find it useful.