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.
Oh damn!!! That’s pretty impressive. You going to give the 70.2 a shave? I shaved my 50.2 and the results were fantastic!!!
I’d definitely be in for one if it works out
Ordered May 13th, delivered May 30th.
No slicing yet that I know of, though you know KB1428 will be doing some sort of dedoming on them.
I got 3 more for the MT03, then I'm out. L6 and MT07 so far.
So you’ve got a r075 and a r100 added and it’s hitting 7,480 lumens? I just want to be sure because I’m interested in resistor modding my MT07 when a aquire a XHP70.2.
yep
There are a couple more tints available besides the P2-1A and P2-3B….from Kaidomain
http://www.leddna.com/2017-new-cree-xhp70-2-led-emitter-cool-white-p2-1c/
http://www.leddna.com/2017-new-cree-xhp70-2-led-emitter-5700k-p2-2c/
I measured amps on a clamp meter at 11.0 with just a pair of VTC6's (solder boobed), and got 7,140 lumens @start.
Then I closed up the tail with the normal two pairs (4) of cells, and got 7,820. So, it's probably pulling higher amps on the two pair of cells. If it's getting a 10% in lumens, could be 20% or so higher in amps.
Since I had resistor mods in place, hard to say what the LED upgrade by itself would do.
Alright…got a few XHP70.2 N4 E2s in…did a ceiling bounce test with my stock MT07 and my Dr. Meter that I purchased a while back (still haven’t learned to use it all that well) and I got a reading of 304. I swapped emitters, added a R100 and a R056 resistor, did another ceiling bounce test and got a 453. Can anyone tell me what that translates to?
A lot of lumens? Not sure if ceiling bounce tests scale same as lumens. If so, and the stock light did about 4,700 lumens (CW) as did mine, then yours is now about 7,000 lumens.
@Tom E, just wondering, what package size are the resistors you modded on this driver? I’m going to order some whilst I wait for the painfully slow boat from china to deliver mine.
Oh boy... Dunno off hand. Not sure if I noted it - I don't see it in my review thread. From the pictures, they appear bigger than 0805's, so probably the next size up. I think 1206's are the common size for sense resistors. Sometimes you'll find bigger ones, but my best guess is 1206's based on the driver pictures I have in the review.