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 youāll not take photos or video youāll not notice PWM on lower mods.
Okay, wrong neighbourhoodā¦
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 donāt like direct drive myself either, and this is going to be my first. But itās 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.
Š½Ń Šø Š½Š°Ń ŃŠ¾Š³Š“Š° Š¾Š½ Š½Šµ Š½ŃŠ¶ŠµŠ½)
I agree DD and PWM suck a littleā¦
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 donāt think thereās 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 havenāt 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 donāt know.
Seems to me they could have used something like the LD-2 driver.
Shouldnāt be a lot more expensive to produce.
Price may be good but the current driver (heart of any flashlight) isnāt interesting at all. To tell the truth itās 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. Thereās only one hope left, a decent case with customization features
The D4ās ramping UI, combined with its high amperage, doesnāt 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 doesnāt 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 ā 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. Itās pretty close though, especially if you donāt 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 wonāt 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 Iām 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. Iām definitely one of those OCD fools drooling over perfectly flat run-time data. And I certainly donāt 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 Iām 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 )
Thatās true.
The generated heat on medium modes (or rather high Amperes combined with big voltage difference between battery and LED, which can also occur on high mode) being the risky thingā¦
Youāre muddling cause and effect here.
Ramping isnāt something particularly desirable by itself, itās only a crutch to make unregulated FET drivers at least somewhat comfortable for ordinary use when you need stable output for a duration of time, not a quick wow-flash.
Constant current drivers donāt need ramping because they already can maintain their output level without any user intervention whatsoever. While direct-drive FET drivers are practically useless without it.
Same for me.
Especially when youāre forced to un-optimize the electrical path to prevent too high currents with a freshly charged cell, then i donāt like the idea at all.
Maybe in the future there will be high capacity LiFePo cells and lower Vf LEDs to make perfect combinations, since LiFePo have a near flat discharge curve.
Weāll see.
So, you wanna say, that linear driver has better heat performance and efficiency on high power rather than boost? FET+1 is less addicted to overheat, so why? Itās much more important how the driver thermal interface developed is. Everything depends on developer. How about stabilization?
Well M43 driver is big because itās calculated this way for required output power but there are other compact boost drivers. You can smoothly adjust the mode in M43. Have no idea what you meant about M43 ramping, really.