KW CSLNM1.TG isn’t gonna last long

Lexel · 2019-01-19T17:34:45.000Z

there is absolutely no advantage of a DD driver for this LED!

tons of disadvantages
even if you limit the current you get full brightness only with full cell then dropping by 10-15% in the first 5% of battery capacity and slowly dropping with further discharge

Using 1S L4P CC driver gets you over a lot of the battery capacity full output,
or
MTN 2S buck,
my 2S Buck drivers
with proper firmware and current gets you over full output till the cells hit LVP under load

DD has its place for multi emitter lights or XPL HI single emitter where you can not cook the LED even with best battery

BlueSwordM · 2019-01-19T17:36:04.000Z

I perfectly agree with Lexel.

Using a CC FET driver, or a buck driver would be much smarter, and cost you less in the long run, since you will not have to kill an LED.

LouieAtienza · 2019-01-19T18:05:42.000Z

Lexel:

DD has its place for multi emitter lights or XPL HI single emitter where you can not cook the LED even with best battery

I have to say, I have a bunch of XP-L HI LEDs and I have retrofit them on a lot of my (and friends’) lights because they seem to be un-killable and just work in many situations…

n10sivern · 2019-01-19T18:21:01.000Z

I agree and I wouldn’t normally run this light with a DD but I didn’t feel like digging out another driver. The driver didn’t damage the LED, but I’m gonna make sure it does. And as I said before, I own very few 2S lights and don’t like the inefficiency of buck drivers. What 2S lights I have run 6V LEDs. Everybody is harping on the driver, but it’s a non-issue. I have linear drivers and I’ll likely use them when I actually do a legitimate build with this LED, but this was for fun and the LED was damaged goods before the driver. Regardless, I was going to push the LED to it’s limits, but now that it was damaged from the factory or reflow, it’s destined to die.

Lexel · 2019-01-19T18:16:15.000Z

n10sivern:

I agree and I wouldn’t normally run this light with a DD but I didn’t feel like digging out another driver. The driver didn’t damage the LED, but I’m gonna make sure it does. And as I said before, I own very few 2S lights and don’t like the inefficiency of buck drivers. What 2S lights I have run 6V LEDs.

you can simply stick 2 1100mAh 18350s in a 18650 light and have your 2S buck driver

n10sivern · 2019-01-19T18:33:45.000Z

Lexel, please explain why I want to buy batteries I don’t already use so that I can run 2S with an inefficient buck driver and less battery capacity when I can just run an 18650 with a linear or DD driver.

Lexel · 2019-01-19T18:44:31.000Z

n10sivern:

Lexel, please explain why I want to buy batteries I don’t already use so that I can run 2S with an inefficient buck driver and less battery capacity when I can just run an 18650 with a linear or DD driver.

Why do you quote a buck driver unseen inefficient?
Burning overhead voltage in FET or with DD with no bypasses, high iR cell and thin wires has ecxactly the same result on efficiency

a 90-92% efficient buck driver with properly bypassed springs and high drain cells should be not less efficient than any other driver concept

you mainly burn overhead voltage on this LED from 3.3V to about 3.8-3.9V on battery
simply do an efficiency calculation on this and you will see how inefficient your DD gets

so lets do the math for you I get to 86% efficiency with full cell with 3.3V LED and 3.85V from battery
with lower cell voltage and less current that efficiency goes up, but also on a buck driver on medium currents this is the case

but if we start too look into your medium modes with full cell
DD is PWMed while CC Buck driver gains extra efficiency as it does not drive the LED on full current, so the losses in the wiring are reduced and the LED runs more efficient

as a summary often in medium moded and full current the Buck driver beats any DD driver,
the only advantage has DD+7135 at very low moon modes where its naturally more efficient as no buck controller has to be used which got some static losses which do not decrease with current

n10sivern · 2019-01-19T19:12:05.000Z

Buck drivers can be inefficient, especially the cheaper ones. More expensive well made ones can be efficient. I’ve never felt the need to use the more expensive ones when I have other cheaper options to use. I have never seen where I will significantly benefit much from them to justify spending more.

I don’t just have DD drivers. I have linear/regulated drivers as well. I don’t use any mode other than high in my hunting lights. I have a couple of lights with no driver at all, just a contact board and wires. I only have one light with moonlight, and I rarely use it. My lights are either about how far will it throw or how big of an area will it light up full throttle. I have numerous liner and DD drivers with guppydrv on them but they typically stay in 100% mode only. The only lights I use in other modes are the ones I keep around the house that rarely get used.

Pöbel · 2019-01-19T19:29:15.000Z

i can understand your point. especially when you have NVGs the need for low power lights decreases.

I can also relate that just for spotting a kiss solution can be absolutely sufficient.

It’s just different use cases requiring different tools

n10sivern · 2019-01-19T21:18:22.000Z

At least somebody understands

Talpa · 2019-01-19T23:44:54.000Z

Good post. As a hunter I totally understand your points. For real, the stock C8+ with 100% mode only is what is totally enough for hunting purposes for me. But I built one with white flat. And now all my hunter friends are wanting one too

n10sivern · 2019-01-20T00:04:19.000Z

We have a hog problem and a 1000 yard long field so I need lights that throw like a big dog.

teacher · 2019-01-20T00:13:35.000Z

n10sivern:

At least somebody understands

Hey, I understand. You have something that works for you & your sticking with it. :+1:
I imagine you have plenty of hog kills racked up to your credit to not feel the need to change a thing.
Ever need or want another gun I’m available…. . I have just about recovered from the absolute shock of ’The Game’…. :cry: . :person_facepalming:

Talpa · 2019-01-20T00:14:27.000Z

I understand the negatives, but otherwise I’d love to hunt that way. Most countries in europe night vision and lights for hunting are forbidden. Ok, you can spot animals with night vision, thats difficult to ban.

Enderman · 2019-01-20T00:18:16.000Z

n10sivern:

At least somebody understands

I think what you don’t understand is that driver efficiency is not the same as overall efficiency.
Yeah direct drive is technically 100% efficient since no power is being lost by the driver, but you’re losing tons of efficiency by not driving the LED at the peak output, it’s almost always before or after the peak of the curve.

So even a crappy 75% efficient buck driver that regulates the current would offer better performance and runtime than the inconsistent direct drive strategy.

teacher · 2019-01-20T00:21:24.000Z

Talpa:

I understand the negatives, but otherwise I’d love to hunt that way. Most countries in europe night vision and lights for hunting are forbidden. Ok, you can spot animals with night vision, thats difficult to ban.

For game animals it is forbidden here to Talpa. But for wild hogs just about anything goes here. They are invasive & populations are growing in leaps & bounds. They are devistating farm land & crops here in much of the USA & open season has been declared on them. Otherwise they are going to take over. In many place they almost have already.

Talpa · 2019-01-20T00:35:36.000Z

Here the biggest fear is african swine fever. Many countries have legalized lights in wild boar hunting because of that. Latest here in Finland also.

n10sivern · 2019-01-20T01:06:10.000Z

I run my NV setup as a scouting setup. I do use it to shoot but it is setup for suppressor and subsonic ammo which limits me to 100 yards or less. Outside of that range, I scout with NV and light them up with white light thrower.

I DD most of my throwers because they are XPL-HI’s and dedomed XPG2’s and a few XML2’s. I don’t tend to use low Vf emitters for my throwers for that reason. I linear drive most of the other emitters.

teacher · 2019-01-20T00:45:40.000Z

Talpa:

Here the biggest fear is african swine fever. Many countries have legalized lights in wild boar hunting because of that. Latest here in Finland also.

I understand. Here are a few articles about the growing problem here in the USA.

Invasive Wild Pigs Are Spreading Across The United States

The Weather Channel

Invasive Wild Pigs Are Spreading Across The United States | The Weather Channel

A new study shows that invasive wild pig populations are on the rise in the United States. - Articles from The Weather Channel | weather.com

Feral Pigs Going Hog-Wild in US

livescience.com – 9 Apr 13

Feral Pigs Going Hog-Wild in US

Feral pigs can now be found in three-fourths of the U.S., and their populations are expanding. New Mexico and the USDA recently began a $1 million project to hunt and kill the animals.

Wild Pigs Are Taking Over America and Your County Is Next

Gizmodo – 2 Feb 17

Wild Pigs Are Taking Over America and Your County Is Next

Pigs are invading, and could be coming to a county near you. At least, that’s what a new study says.

Talpa · 2019-01-20T00:56:54.000Z

Yep, lost battle already. Although possibility to have an influence on the problem on your property.