*BLF LT1 Lantern Project) (updated Nov,17,2020)

[Eraursls1984]

@djozz

@DBSAR

@TheShadowGuy

The bigger the spread the better, in my opinion. The Samsung LH351Ds from what I’ve seen are an excellent choice.

I will suggest to the manufacturer to try to source the 351Ds in 2700K for the warm side and 5000K for the cool side of the two channels for tint ramping, that will give a good range of tints.

I think it is too much to ask for Sofirn, but if you never ask for it you will certainly not get it:
Could you ask for the 2700K led for one of the colour-bins W1 to W8, and for the 5000K leds for colour-bins R1 or R2? These Samsung tint bins are on or below the black body line, if Sofirn was able to source them (in 90 CRI of course) that would be awesome for the tint of the Lantern.

The major downside to the 2700K is the significant drop in efficiency compared to the 3000K. I’d prefer 2700K of they were the same or close, but would prefer efficiency since they are not.

[sbslider]

@ BlueSwordM and fixed it, thanks for the explanations. I definitely have noticed that LEDs get way less lumens/mA (or lumens/W) when they are driven very hard. But I was under the belief (perhaps, or likely wrong) that at lower drive currents, the lumens/mA curve was pretty constant. So with 4 LEDs each drawing 350mA (fairly low current) the efficiency of the 4 7135s can be no worse than the efficiency of a single FET. But at lower currents, if the switching performance of the 7135 is lousy (sounds like a great BLF improvement project!!) then I can see where the efficiency of the single FET would be better.

[Agro]

@The_Driver

@The_Driver

Why not a MOSFET based linear driver with higher efficiency in the low modes like the LD4 and texas commander drivers?

Nobody thinks this is a good idea? Less components and higher efficiency.

Me thinks so

[Agro]

@djozz

@The_Driver

@The_Driver

Why not a MOSFET based linear driver with higher efficiency in the low modes like the LD4 and texas commander drivers?

Nobody thinks this is a good idea? Less components and higher efficiency.

Someone has to design it. Designing parts of this lantern has been slow sofar, only now even the driver takes final form and I believe it is nice that it is being done at all and that it will have nice options and firmware. And an even more efficient driver without PWM like you suggest (I agree that for a relatively low-powered light like the lantern a FET-based lineair driver would be a suitable application) would require lots of extra expertise and time. Apart from that, I wonder if you could get output and tint ramping done without old-school PWM?

Isn’t Texas Commander the right driver?

[Kingjohn]

please put me on the list for one…

[The_Driver1 (The_Driver)]

@Agro

@djozz

@The_Driver

@The_Driver

Why not a MOSFET based linear driver with higher efficiency in the low modes like the LD4 and texas commander drivers?

Nobody thinks this is a good idea? Less components and higher efficiency.

Someone has to design it. Designing parts of this lantern has been slow sofar, only now even the driver takes final form and I believe it is nice that it is being done at all and that it will have nice options and firmware. And an even more efficient driver without PWM like you suggest (I agree that for a relatively low-powered light like the lantern a FET-based lineair driver would be a suitable application) would require lots of extra expertise and time. Apart from that, I wonder if you could get output and tint ramping done without old-school PWM?

Isn’t Texas Commander the right driver?

We need a dual channel version of that.

[deleted-200707]

unsubscribed

I have less interest in Lumintop than they have in their customers

[BlueSwordM]

Huh? Lumintop isn’t building the lights, it’s Sofirn actually.

[deleted-200707]

Then I’m happy and disregard my Lumintop warning.

[bmengineer]

@chinooker

unsubscribed

I have less interest in Lumintop than they have in their customers

I don’t know what Lumintop did to offend you, but it would be great if you could stop spamming every single thread. If you have something to say, make your own thread and say it.

[sbslider]

@Kingjohn

please put me on the list for one…

Kingjohn added to the interest list at number 957

[Lexel]

first request was just 2x4AMC driver

added Powerbank stuff

CC regulated MOSFETS

7135s removed
CC regulated without PWM added
LDOmadded
indicator Led removed for voltage divider

[Phlogiston]

@Lexel

CC regulated MOSFETS

7135s removed
CC regulated without PWM added
LDOmadded
indicator Led removed for voltage divider

Wow. I’m up for that one!

[jigsaw]

Looks like the surgery didn’t slow you down? Very impressive. Thanks for your all your efforts!

[The_Driver1 (The_Driver)]

Nice! Thanks Lexel!

[sbslider]

WOW :+1:

[severide]

Nice job, Lexel! Thanks!

[KevinZA1988]

If I could buy these guys a beer I would buy them a bar. Thank you all for making this come true!

[The_Driver1 (The_Driver)]

Lexel, what is the lowest possible current with that FET driver?

[Lexel]

its one Channel PWM and should not suffer from low PWM cycle like AMCs are so 0.4%

I am not sure which current we get with lowered MCU voltage
from 5V as DELs driver was designed, here we got 2.8V we should get about 60%

Not sure which current he calculated, need to be tested