I ordered mine with frosted optics,then got the narrow to swap. I noticed big difference. Almost like 2 different lights. They are both bright, lemons very close.
As others have suggested before, It would be so nice if Hank invested in developing a current regulated driver with the D4 user interface. Instead of making these 219C and SST-20 D4’s just hot and inefficient, they could be run in a much more efficient regime, with not that much lower output.
With more and more emitters with extreme low voltages, such regulated driver (perhaps even buck- ) would be an asset for the Emisar brand flashlights.
I wonder if it was feasable to order the D4 or D4S with a 2x2 array of SST20 5.000K with 6500K or 3000K with 4000K. I wouldn't want to mix 65CRI and 95CRI, though.
All builders could heed the voice of reason and sanity in this ‘sizzle sells’ market.
It is precisely why I use a MecArmy PT16/18 instead of my D4 lights.
This 2200mA buck driver (just new from KD, I bought 2 of these) claims a total height of 8mm. For a D4 type of light you want at least 6A to drive 4 SST-20 leds to a decent output, so a bigger coil is probably needed, adding thickness.
That's great news! Thank you Jay! Does he also offer different optics installed upon request? I only know about the 10622 as the standard optic for the D4.
He also offers the 10623 floody optic for the D4, which you can find in the regular options when ordering. Throw is reduced, but it makes for a smooth floody beam that’s great for indoor/close range use. For general purpose/edc, I’d stick with the 10622.
TK measured the driver cavity previously. It’s only about 2.5mm deep:
With a 4.5mm thick shelf, however, careful machining could hypothetically make a pocket for an inductor. I think even machining all the way through the shelf, as long as you kept the pocket no larger than necessary, would have a reasonably small effect on the heat transfer from the MCPCB to the rest of the body, especially for a 5.5A driver.
Has anyone ever figured out what the “grainy” finish is on the D4 and D1S lights? Its very unique and I can find no explanation of it anywhere, I have the white D4 and the grey D1S. I guess I want to know out of curiosity.