There some other aspects that I would like to point out, but aren't they actually explained by Led4Power already? Like working with old-school clickies and also with tactile switches (aka digital switches), moonlight level select, thermistor....
Also the circuit was designed and created by Led4Power.
If we in the US could put together a group buy, I will commit to at least five (maybe more if kept close to 50 pc. price) with additional shipping once in US. I’m not sure I could handle the group buy side as I don’t have experience with that sort of thing. Please let me know if there is any way of working something out with those of us in the states.
Thank you for taking a constructive approach to the MOQ issue. It looks like, with a little luck, a GB will indeed be forthcoming. If so, I too will place an order.
If someone is looking to do a US group buy I could do 2 or 3. I guess we’ll see who else speaks up.
I have yet to come across someone who sells a own design dedicated flashlight part at these low quantities who has become rich of that.
Led4power has been an active BLF-member for a few years, I think his motivation has not solely been making money. No doubt he has spend numerous hours developing and testing these drivers, and I would be a bit surprised if the total sales will result in any form of descent wages for all those hours.
Ok,I give up,min. order for non EU countries is 10pcs,best I can do currently.
I don’t see why some people get upset over the MOQ, you have to understand this is not a mass produced item sold by an retail online shop, but a very custom driver designed to please a very specific group of users.
led4power thank you for lowering the minimun qty, 10pcs is very accessible and I would gladly organize the GB if I lived in the US.
Well to be fair, 10 is a lot easier than 50, its US$149 v US$645
US$645 is like a years wages in NZ :bigsmile:
Sometimes the tone is more in the readers mind than the writers. Some people, myself included, type or write more abruptly than they would speak too…its still just statements of fact and not necessarily the intent to attack.
If anyone in Perth, Western Australia wants to split 10 of them I am happy to take 5.
pinkpanda3310 I’m looking at you. Haha
Somebody let me know if Intl-out. or GB/BG/FT start selling this. I’ll be hanging with my buddy OshPark if you need me.
I'll take a couple but I'm not in Perth, I hope djozz doesn't mind.
Im in for two if we do an Aus wide GB… I can add them to the 4 LD1s I havent used yet.
I never stated he was ‘becoming rich’ off this so please stop putting words in my ‘mouth’.
I correctly stated that he is clearly NOT selling these at a loss when I was called out for ‘shaming’ someone who was supposedly doing us all a favour.
Obviously I understand time and effort went into developing this driver but perhaps you need to acknowledge it wasn’t done out of charity either.
Fifty pieces was an excessive MOQ for such a niche item. If your opinion differs so be it I’ve nothing more to add.
Funny, that’s the main reason I returned to NZ from AU …. more profitable here.
Would this driver be good for the BLF EE X6?
Hi,
are the parts for 3x LiIon Support already available for order? Are resistors available for 5A output current? (The newer XM-L2 burn at ~5,5A)
Regards
Kenjii
For 3 cell in series you'll need 375kohm 0402 resistor,instead of 750kohm(2S parts consist of 1 op-amp and two 750k 0402 resistors).I don't have 375kohm value,but you can stack two 750k in parallel.
Based on reports from blf members, you shouldn't worry about blowing new xm-l2 with single cell,because they have very high Vf.I see i forgot to add equation for max. current set resistor:
Rx[kOhm]=900/Imax[A]
For example,stock value for 6A is 150k,for 5A you need 180k resistor.
Can i use this driver for a tripple, the LD-1 was single emitter only right ?.
This is a very good question, can we use this for triples & quads? And what max amp do we get then with high drain battery & XM-L2 class emitters?
And is 6A really the max for a single emitter? what if we use a lower ohm resistor than 150k?
What I understand is that you can set the resistor for higher amps (if battery/flashlight/emitter allows that).
on a side note:
The 'triple question' also emerged for the LD1, but I do not really understand this type of driver for triples (unless you have severe emotional problems with PWM):
*each emitter in a triple will typically receive only moderate current, say 3A, then the efficiency improvement of this driver at lower modes, compared to a PWM-ed direct driver, will be considerably less than with using a single emitter at 6A.
*at the high setting in a triple I would not want to limit the current, I want my leds to receive all the current they can get and turn it into light, the emitters will not be at their maximum performance anyway (but this is of course quite a BLF-point-of-view ;-) )
For a triple I would go for a BLF-DD driver, I would not even bother using a FET+7135 driver for the same reason as above.
(sorry, this should have been in a discussion thread)
It is my opinion, and only my opinion, that you’re wrong about the decrease in extra efficiency of this driver comparing a triple with this driver to a triple using a PWM’d driver, versus the same two drivers with a single emitter each. Isn’t it true that emitters become increasingly efficient at lower and lower currents? So, the difference in efficiency from 6A to 3A is less than the difference from 3A to 1A, isn’t it? Or am I the one who is reading the PCT wrong? I see for instance, the XHP-70 at 4A (the highest the PCT goes) has an efficiency of 136 lumens per watt. The change in efficiency from 4A to 3A is 14 lm/w to 150 lm/w total. The change from 3A to 2A is 17.2 lm/w, and the change from 2A to 1A is 22.5 lm/w. So, the lower you go, the faster the gains stack up. This is all on top of the fact that the Vf goes down, which should give us better regulation to lower levels, and better run-time. Right? Or, am I missing something? Be kind, I’m still a newbie. 
As for using a FET, that would make sense coming from your perspective of wanting all you can get from each emitter. Obviously, any driver that has an inherent max top end that is a lot lower than the top end of the emitter will not be suitable to reach that goal. But, maybe that isn’t everyone’s goal, even though we are on BLF! 