The white flat is ideal for single cell lights with a linear driver.
A constant current driver though, DD drivers will kill them,
unless you use a crappy battery and / or crappy electrical path and STILL only have full output with a freshly charged cell…
Yes. I agree since all your mentioned variables must be prepared for FET DD setup but hey! Mine did not die yet (1 and 2mm version).
So linear drivers.
Do you remember these guys: Nanjg 105C, AK-47, Nanjg 101-AK-A1, Nanjg 105D etc… That is if you are on the budget.
Chips stacking art (AMC 7135/8 current regulators). That seems like forgotten art? 
If you want the best there are L4P drivers, TA series and others…
For your viewing pleasure good, nice and cheap:
- In 17mm: LD-25 new version @ FastTech. Review by Henrik. Straight current adjustable. I'd ensure a good heath path for it, even to the point of copper heatsinking the MOSFET if raising current a lot.
- In 20mm: LD-29 updated version @ FastTech. According to HKJ reviews (1st, 2nd) its sense voltage is 75mV (25mΩ sense resistor for 3A stock driving current). Accepts 1S and 2S input.
Suffice to say both drivers PWM free.
Cheers 
I would need something in 5-5.5A on high, 2-2.5A on med and 0.5-1A on low… I don’t care for PWM. High or turbo will be most used mode anyway 
Pretty easy to do:
For the LD-29 each stacked R050 is 1.5A, R100 is 0.75A, R200 is 0.375A, and so on.
Wow, that’s nice
Do you know if the memory-function on this drivers can be deactivated?
There must be some way, but better wait for at least some expert to chime in…
Cheers 
Well, I doubt that my measrurements are combarable only for myself… Maybe have to think little better way to do those.
But compared throw and it was pretty same than EmisarD1S, was hard to say which was better.
What's all of this C8 gossiping? Does this mean the white flats are not well suited for its reflector? Or WTF?
Dedomed XP-G2 at 4.5A does 170Kcd in a C8? How is that? As far as I know an XP-L HI at 6A will maybe do 90Kcd, doesn't it? It's hard for me to believe the XP-G2 doing that much better against the XP-L HI 5700K in a Sofirn C8T.
Cheers 
Throw is from the led /reflector size and led intensity/mm2 emitting surface. A dedomed XP-G2 has higher intensity/mm1 than XP-L HI. that is all.
See my measurement tables. You will find over 200 measurement and it has dedomed XP-G2 and osram white flats and etc.
My C8 with dedomed XP-G2 made 151,7 kcd from 850 lumens. The second best is 136 kcd with dedomed SST40 in a C8. but with 2000 lumens.
I wasn’t trying to start a competition about who’s C8 is the best. I’m just trying to understand each report of a measurement of this new LED so we can know it’s capabilities.
Of course comparison of different v people’s results is made difficult because of different measurement conditions and equipment.
… i.e. the hotspot of these leds in a reflector light is around 6000K, at which colour temperature all budget luxmeters read too much, think between 5% and 12%.
Barkuti mentioned the LD25, which is cheap.
Ordered some low resistance resistors to mod them up to 5 Amperes.
Yeah, the forgotten art of stacking 7135’s
Old school. I still have some 80 pieces of Raptor Claws though.
But those things always eat at least 150 mV, which is a shame.
And then there’s the audible PWM, which i have grown to despise…
Not to mention the war between retaining rings and the 7135’s on the battery side…
The 3 modes of the Nanjg’s are well spaced though. :+1:
Better than the LD25.
Barkuti mentioned the LD25… And I can see they are from Simon?
IF so just contact that guy and he will do 10 plus order for free…
I ordered more than 200 drivers from Simon (I had special wishes without any amc 7135 current regulator on nanjg AK-47 C1 for making Djozz fet driver) for ultra budget price.
About that LD 25…
So basically:
- Aligator clamps for positive DMM wire clamped to spring
- Negative should be classic DMM wire probe touching driver outer ring?
- With small wire we are raising/reducing current
But all that can’t be done with classic DMM? 
Right? We need constant current power supply for that?
LD-25 available at Simon's store and FastTech.
(I think) Simon filmed the LD-25 current output adjustment video with a precision power supply with voltmeter and amperimeter because of simplicity: he uses the supply in constant voltage mode, making sure there's enough input voltage headroom to overcome the drop in the supply to driver wire and contact resistances, and reads the current pulled in the supply's amperimeter. If, for example, you determine input wires plus alligator clips and contacts have around 0.2Ω of resistance and you aim for 5A at the driver, make sure you add ΔV = I × Rpath = 5A × 0.2Ω = 1V to the bare minimum voltage the LD-25 needs at its input to deliver the current at the emitter. Failure to do this will result in the current capping at some point, if this happens just raise the input voltage accordingly and try again.
If no precision power supply with amperimeter display available a multimeter can be used amidst in amperimeter mode, just make sure you raise input voltage enough. ;-)
Cheers :-)
Barkuti, that video is of the previous model LD25.
But i think Kaidomain has the old version in stock.
I don’t know if the same trick works on the newest version, but the PCB layout it very different.
Mmmkay, I have an LD-25 new version from FastTech laying around and a precision power supply with amperimeter. Will check it out soon, just a little bit of patience.
Cheers ^:)
If I need precision power supply with amperimeter than LD-25 goes to super expensive driver category…
No one said you “need” a precision power supply. You need a way to know how much current is the driver pulling, this can also be achieved with a clamp meter somewhere.
Messing with the sense resistor is possible too. 
Cheers ^:)
Ok…
Than instead of precision power supply with amperimeter please instruct us how to do that with DMM and clamp meter.
I’ll pay you a beer or even couple of them
Pretty please…