MT-G2 - Lets measure throw

This thread is to gather throw readings on the MT-G2 in various reflectors at various currents to better understand how to get this emitter to throw. I will periodically summarize all contributions in this OP.

KD 86mm x 90mm SMO w/o Lens - (Post 1) - 87kcd at 5ish amps

Ultrafire T90 - (Post 4) - 51kcd at 5ish amps

Ultrafire-T90 - Dedomed - 198kcd at about 11.3 amps

Small Sun ZY-T08 - (Post 7) - 35kcd at 5 amps

Small Sun ZY-T08 - (Post 10) - 78kcd at ? amps

Trustfire X8 Clone - (Post 8 ) - 21kcd at 7 amps

KD 86mm x 90mm SMO w/o Lens - Dedomed (Post 9) - 119kcd at 6.3 amps

Illumination Machines LUM 5-90 - Dedomed (Post 10) - 54kcd at 6.3 amps

Defiant Super Thrower - (Post 11) – 52kcd at 4.5 amps

Defiant Super Thrower - Dedomed (Posts 12, 17, & 26) – 38kcd at 2 amps, 60kcd at 3.5 amps, and 71kcd at 4.8 amps

Defiant Super Thrower - Dedomed (Post 36) – 94kcd at about 6 amps

Defiant XML Spotlight - Dedomed - (Post 22) - 250kcd at 5.6 to 6 amps

Defiant 3C MT-G2, 4 x 26650 custom build - 47kcd at 5.5 - 6amps

Digital Projector Spotlight - Dedomed - 213kcd at about 6 amps

Dereelight Xsearcher - ~70-75kcd at 4.4A

Dereelight Xsearcher - Dedomed - ~110kcd at about 5.25A

100 mm Aspheric Lens - Dedomed in DST - 399kcd at about 6 amps

TN35vn - 150kcd at about 7 - 7.5 amps

Crelant 7G10 - Dedomed - 163kcd at about 9 amps

FmC’s Scratch Build w/ 110mm FT Reflector - 160kcd DD w/Samsung 25r’s 2S2P

Using the deep KD reflector (link below} measured 87K lux (peak) at 1 meter. Direct drive with 2 unprotected NCR18650’s (date code 9926). Current before measuring lux was 5 amps. Emitter Domed.

EDIT: I didn’t play with focus. Reflector resting on MCPCB. I will be testing at least 3 other reflectors. Illumination Machines ST90, Defiant XML Spotlight reflector, and the WideShine Spotlight reflector. I expect the IM reflector to be quite a bit lower and the Defiant reflector to be higher based on seeing them in action. I haven’t received the WideShine yet, but expect it to be higher than the Defiant.

EDIT2: Reflector reviewed here.

I’m surprised to see it that high. I would estimate my ultrafire-T90 mod to be much less than that. It was pushing 7amps through a 70mm reflector.

What host?

UltraFire T90 (TrustFire X6 copy), 73mm dia. x53.8mm length
Driven at 5A ish
Intensity: 51kcd in one large smooth hotspot.

Host? It has 1/4” thick walls and aluminum pill (pressed in) topped with copper sheet (forget thickness). Copper emitter base reflowed to copper sheet. 3” PVC pipe is snug and holds what ever position I put it in.

I’m new to measuring lux. For reference, my TN31 measured 13460 (peak again) at 10ft when it was stock.

Subscribed. Thanks for all of your determination in trying to make good use of the mtg2.

Small Sun ZY-T08 , 57.7mm dia. x 38.5mm depth
Drive current (estimated): ~5A
Intensity: 35kcd
Note: Intensity measured after installing DRY driver instead of the one in the mod post.

Ultrafire clone of TrustFire X8
Drive current: ~7A (driver = piece of wire, definition of Direct Drive :wink: )
Intensity: 21kcd

This reading is likely not representative of a dedomed MT-G2. This emitter has been to hell and back several times. It has been reflowed no less then 7 times. Some of them at excessive temperatures on huge copper pills that hold the elevated temps for too long. It has also had wires soldered to it too many times to count. This emitter is one tough hombre.

Worse though, it accidentally touched a black plastic reflector (Defiant xml Spotlight reflector) while it was on once. It instantly melted the plastic and some stuck to it. It was fused to the emitter and I finally had to just let it burn off. There is permanent black residue on the phosphor. Most of the emitter’s hot spot is darkened by this residue. It is clearly visible on white walls and in measurement.

Similar up as in post 1, except Panasonic CGR18650CH’s and emitter at 10 feet because the hot spot is too small. No lens over reflector.

Peak reading 12,790 lux (118.8kcd)

Illumination Machines LUM 5-90

This reflector with the MTG2 makes the most useful, beautiful beam I have ever seen. Wider diameter that a SKR, brighter spill than a SRK, but also has very nice throw. Really lights up an area with beautifully tinted, decent cri light. I have used it with domed and dedomed MGT2. To me, the beam is best with a domed emitter.

Used same damaged Dedomed emitter discussed in Post 9 and 2 Panasonic CGR18650CH’s direct drive. Amperage was measuring 6 to 6.5 amps. Lets call it 6.3 amps. 10 feet with no lens:

Peak reading 5,810 lux (54kcd)

Defiant Super Thrower - 52.3kcd at 4.5 amps

2 NCR18650 laptop pulls in direct drive. Read 4.5amps before lux measurement. AR lens. All my set ups posted in this thread so far have been on Noctigon copper bases. Peak lux reading was 5,630 at 10 feet.

That’s pretty good! I’m getting 38010 lux with my shorty DST, DD, with 2xSiebele 18350 IMR, but I have a 0.5 ohm resistor. Tailcap is ~2 amps. Maybe I should remove the resistor :).

Edit: MT-G2 is also on Noctigon.

At what distance Ohaya? I would like to post you’re measurement in the OP. Each one will contribute to understanding this hard to throw emitter.

ohaya, I’m doing direct drive with a piece of wire from 2xPANA18650PD high drains, resistance mods for all springs. I get ~7A, which the MT-G2 sees comfortable with on copper.
I’m quite confident you can get rid of the resistors safely. J)

I measure the lux at 39 feet, then calculate back to 1 meter, so the number that I posted was at 1 meter (calculated).


P.S. Thanks for doing this!

Yes, I understand. I was being safe when I added the MT-G2, but I just haven’t had time to remove the resistor yet.


sorry, forgot to mention - dedomed and original lens.

Thanks Ohaya. Please update us if you change anything. I think your dedomed emitter is probably the best one out there right now.

Bummer. I was hoping for a lot more from the lum 5-90…. havent even played with mine…