Emisar D1S Oslon Black flat mod 340k+cd

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You may want to hold off on that order. I'm getting lousy measurements. Higher Vf's and lower calculated lumens then both djozz and koef3 reported. Please keep in mind that my lumen calculation could be way off as I haven't really spent much time working on my integrating tube and have never measured a bare emitter. I hobbled a set up just a bit ago. So there is all kinds of potential for errors. Conversion factor derived from maukka calibration lights.

Current Vf Lux Lumens
1

3.14

364 245
2 3.49 617 415
3 3.78

814

547
4 4.04 955 642
5 4.31 1040 699

EDIT: Improved the setup up. I was losing lumens around the heatsink. I resolved that a good bit, but am still losing some lumens. My new measurements are as follows:

Current Vf Lux Lumens
1

3.14

445 305
2 3.49 763 523
3 3.78

1009

692
4 4.04 1186 813
5 4.31 1290 885

That Vf seems way too high for this LED at max brightness.

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I definitely was a bit disappointed in the Vf results. The reading seems reasonable according to the bins listed in the datasheet. Used a DPS5015 to provide power and to measure Vf. Used about one foot of 18 gauge leads. Didn't see signs of thermal sag.

I will remeasure tonight with a meter directly on the emitter.

That explains it partly. Your meter will probably measure lower values.

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You weren't kidding. I was expecting a small difference, but was surprised. I verified power supply readings at the power supply terminals, no problem. Then measured at the emitter pads. I read 3.02, 3.23, 3.42, 3.60 , and 3.80 volts at 1 through 5 amps, respectively. Good news from an emitter efficiency standpoint. Thank you for sharing your observation The_Driver.

Those values are realistic. The LED is probably brightest at 4-4.7A.?

Thats great! who can make a distance ring for black flat?

The GT mini also has same body setup like D1S. 5 black flats ordered last week and I will put one in aa GT mini, one in a Convoy L2 on led4power MCPCB. And maybe one in a modded Convoy S8 to see what throw I can get from a small tube light.

On C8 you can get up to 300kcd with 1000% perfect focus and a “good” Black Flat .

You misread it. S8 not C8 :wink:
Small tube light like S2. Basically it already has an S2 smooth reflector and a dedomed XP-G2 now with 3,15A 9x7135 driver and AR coated lens. It makes 22500 cd in that config.

Oops , sorry Zozz :slight_smile:

No problem. It is not a small tube light what came in people’s mind first when talking about black flat mod :slight_smile:

The HaikeLite MT07S - HI seems like a good candidate for this emitter for any that don't want to electrically insulate under the emitter base. Looks like you would just need to use plastic screws to keep the driver from grounding to the host. Maybe a piece of kapton tape under the 2 driver screw a points for extra measure.

Pluses:

  • Smooth reflector.
  • The light would already have a large XP emitter base.
  • I'm assuming a buck driver? Just sense resister to 4 or so amps. Should have good run times

EDIT: Fixed some typos & added content

So I reflowed it perfectly on the board and it work nicely.

Wanting to use FET driver but is it too much current for this led?

Other review state the max it can handle is 5.4A

At 5.4 it will not be at maximum brightness and be a bit blue tinted. 4A - 4.5A is optimal.

Yeah for a regular flashlight host you want to stick to between 4-5A
5+ is possible if you have good active cooling.

The 2 pin version is in stock at ARROW for $2.93 each. Just ordered 5 to play with.

How do you limit the amps to the black flat on the D1S? Do you just use a low current battery or do you have to replace the driver?

Low current battery like an NCR18650B, replacing the driver, or perhaps, just remove the high current BeCu springs and replace them with steel ones.

Black flats arriver few days ago. I putted in an L2 and a GT mini. Not tried them just picked the first. In the GT mini I got strange ring beam and only 160 kcd.
Replaced the reflector with the Emisar D1S (perfect fit) and I got 214 kcd. Still not happy with results completely. These numbers are measured with GA cells. With HG2 it was worse. The L2 is worse then old XP-G2 S4 2B dedomed.