Haikelite MT07 mods.

Hey guys,
I’ve ordered an MT07 as I don’t have a big light and kinda want one. I’m planning to see if I can source a smooth reflector for it and then pair that with a sliced XHP50.2. I was wondering what can be done driver wise to boost the current. I’ve had a search and can’t really find anything. Anyone done anything with these?
All advice welcome.
Thom

Hi Thom, did you check Kaidomain reflectors like this one?

http://www.kaidomain.com/p/S022485.86_2mm-D-x-84_7mm-H-SMO-Reflector

Yeah but that’s ones huge compared to stock. Stock is 72x68 (DxH).

My guess is the driver is similar to MT03 only with 1 channel, but similar parts.
A picture would help though. :slight_smile:
But the MT03 channels are rather under-built, with tiny inductors, diodes and FETs.

I resistor modded the MT07 - think it's in my review thread here.

Here's the info from post #130:


I did, however, apply a resistor mod last night (added an R075 to existing R056 and R082). Mode outputs on fresh charged set of SANYO GA's are now:

  1. low-low: 56 lumens
  2. low: 610 lumens
  3. mid: 1,570 lumens
  4. hi: 2,530 lumens
  5. turbo: 5,300 lumens @30 secs

Throw is now 140 kcd (748m), up from 132 kcd

Forgot to measure moon, but it's still very low, appears unaffected...

A sliced XHP70.2, SMO reflector and a hot FET driver would be awesome in this light. In my L6 I hit ~17 amps with a FET based driver and XHP70.2.

I’m waiting on the XHP70.2 to hit Mouser or Digikey…should be around the end of this month. I’m going to replace the XHP70 in my MT07 with a XHP70.2 5000k.

To be honest I’m starting to come to the same conclusion about FET’s as many people, they are great for initial output and wow factor but constant current seems like a better option for the .2 generation of XHP’s. If I turn off my turbo timer and take a measure of tail cap current on my 50.2 C8 I can watch it start at ~10A and then take a nose dive. I think ~7A would be great for a 50.2, don’t know about the 70.2 as I’ve never seen/used one.
For the MT07 I’m thinking a 50.2 sliced and run at 7A would probably out throw the 70 that’s in there for similar lumen output. Just need to find a suitable driver. Also finding a reflector is proving difficult, nothing on Kaidomain or FT is anything close size wise and I don’t have the tools or know how to machine down a reflector.

Constant current drivers, at least decent ones, are a problem for us - nothing open source available, so can't do them cheap. Not even sure about the higher currents.

Yeah I guess that is true.
Just out of curiosity, when you did the resistor mod did you add a resistor to each existing one of just to one?

They are in parallel, so here: http://www.sengpielaudio.com/calculator-paralresist.htm

Doesn't matter which one you piggyback to. I added only one R075. Wasn't look'n for a dramatic boost, but got a nice little bump.

thanks for that I info. Didn’t realise they were in parallel. Did you take a current measurement after the resistor mod? I’d be interested to see what the difference is so I can try and mod to a specific current. Sorry for the barrage of questions

I'm not too confident with the resistor mod. I added another R100 since then, and now I get 7.3A measured on a pair of SANYO GA's, I think I measured 6.7A originally the same way. I can't figure this driver out though. When I added the R100 and also replaced the LED with a P2 1C, and the output didn't go up. Not sure If I had a bad LED or bad solder flow - all looks good.

Planning on using an XHP70.2 though.

You checked the batteries in your lux meter? That can cause issue with output readings.

So I’ve been having a looksie at driver options for this light and have been thinking of using the SRK v2 FET+7135. Now I know this is contradictory to my earlier comment re: FET vs CC drivers but it’s a driver that will fit. One thing is I don’t know anything about momentary switch drivers. I know that one of the switches on the mt07 will be redundant with this driver but where do I solder it to on the board and can I still have the back lit switch? I’m also assuming there would be no issues with wiring both switches to the same pads so either switch will operate the light.
Once again, any and all help greatly appreciated.
Thanks
Thom.

Ahh, funny you should mention this, just measured this up tonight. I feel the best board option at this time is Harley Quin's BLF SRK for a few reasons, thread here: https://budgetlightforum.com/t/-/40540. To stay with using the e-switch, you need an LDO and a driver capable to easily support it. This board is perfect for the MT07 and MT03 btw, almost made for them...

I'm already using one of his in a 16X XHP50 modded light that does 37K lumens.

His latest is V3.4 with bunch of improvements. I used V3.2, pics/info starting at post #51. I have support for LED(s) at the switch - Indicator LED support in NarsilM.

Actually it was a great relief seeing that the MT07 and MT03 fit our standard SRK's.

MT07 should do 8,000 lumens, and the MT03 should do 20K-24K lumens. Easy mods as well, just costs a bunch of change...

My main issue is I don’t have the ability or confidence to build a driver from scratch so I’m limited to what I can get from the likes of mountain electronics. This also means my FW options are limited. I’d be interested to hear how the mt07 performs with this driver though.

Boy, if mine works out, I'd consider building/selling you one. Might even consider building up a bunch, but dunno much bout Int'l shipping.

Edit: Didn't have time for the driver, put I have resistor mods in place, and upgraded the LED to a XHP70.2, still using the stock MCPCB - it's a good one... Wow!

7,480 lumens @start, 7,280 lumens @30 secs, 198 kcd at 5m (890 meters)

Amazing it holds the output so well.

How long did it take those to arrive from Kaidomain?

Anyone try to slice the XHP70.2? If it responds well it could be a real winner.