TK's Emisar D4 review

Oh my poor wallet! Still semi-holding out / hoping for different body colours before I buy more.

Hank, is it upgraded to RampingOS V3?

FYI: the current batch of aluminum Emisar D4 at International Outdoors are partially lego-able with the all Titanium D4s.

Their aluminum heads fit on the titanium body tubes.

Were the original batch not lego-able? O saw several Ti with aluminum heads after they came out.

Any opinion of the new SST20 led compared to the Nichia and XP-L 5000k?

I second Alex64’s request. I am interested in any information on the SST20’s in general.

I’d like a floodier version with XPL; the Nichia doesn’t have enough output and efficiency. Considering the result with the XPL-HD in the D4S, I’d like it in the D4 as well. Should maintain the lumens and drastically spread the beam.

You can put the floody optic instead of the regular one. Would that be sufficient?

I don’t know. I have no idea of lumen and throw with the frosted optics.

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.

That’s two different emitters in the same light, for higher CRI?

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.

That would be outstanding.

I wondered the same thing but it’s not. It’s two choices and you can see it if you scroll down the page on intl-outdoor to make your selection.

Here’s what I copied and pasted:

Neutral White - SST20 4000K 95CRI
Warm White - SST20 3000K 95CRI

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.

I wonder if a buck driver is possible at all. There is really very little height in the driver cavity of the D4. A couple of 7135 would fit though.

Yes, it isn’t listed as an option, but Hank will make them upon request.

D4 SST-20
Left: 3000K/4000K mix tint w/ 10623 optic
Right: 4000K w/ 10622 optic

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.

This buck driver does 5.5A with 6 mm inductor height and 3.5A with 4 mm inductor height: