I’m an angry Russian :smiling_imp:
http://forum.fonarevka.ru/showthread.php?t=36309
We hoped that there will be at least simple step-down driver, not direct drive…… And I can give some more money for normal driver, but there’s no option “normal driver”. Sorry for my ugly English. Vodka, bear, balalayka, caviar.
If your English isn't so great, that's not a problem, but please refrain from swearing.
It's against the rules here at BLF because we want the forum to be family friendly. 
Wow you seem very mature…
Care to explain why the fact that it is a FET driver makes it a “piece of sh” ?
I think that this kind of driver is already used is some of the best seller on BLF, and while I’m not really fond of direct drive it’s only used on Turbo.
If I’m not mistaken, the D4 uses a FET +7135, allowing to be regulated at lower levels no ?
What about efficiency and PWM? One 7135 will give ~380 mA, wouldn’t it? So what should I do with 380 mA light?
This host can carry 5-7W for long time. Which mod do you suggest for this? How much output will it give with HE4@4.2V, with NCR@3.2V?
Just use other mods. Turbo only when needed. If you’ll not take photos or video you’ll not notice PWM on lower mods.
Okay, wrong neighbourhood…
Good luck Hank Wang.
I have M43 and I love it. And I want to have SC600-like flashlight from Hank. But DD killed my dream.
I don’t like direct drive myself either, and this is going to be my first. But it’s the other modes beside turbo that makes the M43 great, so I think I certainly will enjoy the D4 too. :sunglasses:
It can be a good host with LEDs for normal driver :sunglasses:
No, there is not enough place for one that youd like.
ну и нах тогда он не нужен)
I agree DD and PWM suck a little…
I highly prefer constant current drivers.
Of course a constant current Boost driver would be ideal, like what zebralight, armytek and olight uses for their high power headlamps, But for $35 and this compact size I don’t think there’s is reason to complain about pwm to achieve this level of output.
I am very interested, will be on sale in intl-outdoor? or will be only for US people (the shipment from ME is around 15 USD for my country).
Regards (for the price of 35USD seems fine for me, is not perfect but is very nice and powerful with a good interface!)
I haven’t bought a light in a few months but ill buy one of these i want to do a EDC review video. It seems like a light that may fit the market well seeing as lumen numbers always sell.
I don’t know.
Seems to me they could have used something like the LD-2 driver.
Shouldn’t be a lot more expensive to produce.
Price may be good but the current driver (heart of any flashlight) isn’t interesting at all. To tell the truth it’s not even 1% of what most of us expected. Have you ever seen M43 customs? Nope, because the native driver is worth to be respected. There’s only one hope left, a decent case with customization features 
The D4’s ramping UI, combined with its high amperage, doesn’t generally work well with constant-current drivers. The way power is regulated on constant-current drivers tends to make middle levels hot and risky, requiring either limited output or direct heat sinking on the driver.
A Meteor-style driver is too big for the D4, and not ramp-friendly. If I understand correctly, the Meteor gets safe middle levels by having multiple regulators each running at 100%, which is safer than having a bigger regulator running in a mid-range. This gives it the ability to have several regulated levels in a stair-step pattern by turning components on and off. However, it doesn’t allow anything between the stair steps for more than a second or so, because it risks overheating.
The led4power drivers are much smaller with a single rampable regulator, but they have both of the complications which go along with that — limited amp ceiling and heat issues on mid levels. Also, it kinda needs a separate regulation circuit (or maybe PWM) for low levels and moon. It’s pretty close though, especially if you don’t want completely maxed-out lumens, and similar open-source designs might be a good option in the future. That effort has already started with the BLF GT driver.
The D4 uses a proven and popular FET+1 solution instead, which allows safe and smooth ramping with no driver heat issues, but its runtime graphs on medium and high levels won’t be as flat as a fully-regulated driver. Not that anyone would notice this during use, considering that it ramps smoothly to whatever level the user wants.
None of these solutions is perfect; there are tradeoffs in all cases. I think Hank picked a good set of tradeoffs though, and I’m happy he went with a solution which is simple, powerful, and uses my favorite type of UI. Those things matter to me more than a perfectly-flat graph.
^
Many thanks for the in-depth science. I’m definitely one of those OCD fools drooling over perfectly flat run-time data. And I certainly don’t care for FET drives for that reason. But we also know that the excellence of the M43 is definitely not a result of an accident or luck; everything is well thought off. It is what it is, is often said here on this forum, and it certainly is applicable here as well.
I just have so much confidence in Hank that I’m convinced the Emisar models are going to please me a lot. Of course time will tell. :partying_face:
(Of course Hank needs to sell the lights to me first instead of giving everything to Richard, hehe 
)