The There Are No Stupid Questions Thread

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BurningPlayd0h
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Skylight wrote:
Yes, that is what I supposed. I wanted to try the SST20 and 219C 5000K together to increase rosiness and get a 4500K tint. They would get around 3 – 5A per led. Do you think the 219C would draw more current than is good for it?

So I might need to mix LH351D and SST20, throwy in the center and floody outside, not bad either.

You really need a wider CCT variance than 1000K to lower duv significantly. Most 5000K, 90+ CRI 219C bins are pretty green anyhow.

lightwonder
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Why don’t some of the more expensive brands have lvp built in

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lightwonder wrote:
Why don’t some of the more expensive brands have lvp built in

Expensive does not mean better.

That aside, you might need to be more specific.

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lightwonder
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It just seem sensible feature to me extra safety but I understand you shouldn’t just rely on it. I was just thinking why they wouldn’t include it, i would not use one without lvp when using Li-ion Batteries even protected ones.

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All the expensive lights I know of use it. What is an example that you know does not have LVP?

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Starkm32
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Recently tested a new zoomie by Wuben.

While it has both the throw, and the clarity, the convex lens doesn’t seem to have
The photon density of a comparable reflector.

Would appreciate knowing why a reflector casts a much more robust circle of light. Beer

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Starkm32 wrote:
Recently tested a new zoomie by Wuben.

While it has both the throw, and the clarity, the convex lens doesn’t seem to have
The photon density of a comparable reflector.

Would appreciate knowing why a reflector casts a much more robust circle of light. Beer

Most “zoomie” designs waste a lot of light when the LED is highly focused because there is no reflector or TIR optic to capture what is shone to the sides.

Both of the latter capture almost all of the light an emitter produces. I would say “photon density” sounds like intensity/candela though, and zoomies can actually still blow away reflector or TIR lights of the same bezel/head size.

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Starkm32 wrote:
Recently tested a new zoomie by Wuben.

While it has both the throw, and the clarity, the convex lens doesn’t seem to have
The photon density of a comparable reflector.

Would appreciate knowing why a reflector casts a much more robust circle of light. Beer


Like BurningPlayd0h said, it’s about optical efficiency. Typical zoomie efficiency between wide angle and narrow angle can be a factor of 3. It might put out 900 lumen in wide mode, but only 300 lumen in narrow mode. It has terrible efficiency but it can still be pretty intense and throw a long distance.

Did we answer your question, because I’m not sure what you were asking about.

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Starkm32
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Thanks for your responses.

To my eyes, when focused on a distant object, the convex lens throws well, and the
Object can be seen clearly, but it seems like a flat projection while a reflector’s
Light seem more robust, and illuminates with what seems like a more intense beam.

Is it possible a deep reflector throws most of the photons into the projected beam, while the Zoomie is less efficient in doing so. With losses. In arcs of artifacts Question
BurningPlayd0h
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Starkm32 wrote:
Thanks for your responses.

To my eyes, when focused on a distant object, the convex lens throws well, and the
Object can be seen clearly, but it seems like a flat projection while a reflector’s
Light seem more robust, and illuminates with what seems like a more intense beam.

Is it possible a deep reflector throws most of the photons into the projected beam, while the Zoomie is less efficient in doing so. With losses. In arcs of artifacts Question

Not unless the lens or focus is completely f***‘ed

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Reflectors tend to put about 50% of OTF light into the hot spot. The other 50% goes into the spill.

Zoomies put maybe 30% of the light into the narrow focused beam. Something like that. If it’s focused exactly, they basically project an image of the led die. There is no coma or corona around the edge like with a reflector hot spot.

Maybe the perfectly straight columns of light from the projector/convex lens gives that flat appearance. The reflectors columns of light are not perfectly straight. It tends to blend the beams of light together more for a smoother hot spot. IDK, just guessing.

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Starkm32
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Something to haha “reflect” on.
Guess the robust hot spot is spot on for me. Evil

Again, thanks for your responses! Beer

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lightwonder wrote:
Why don't some of the more expensive brands have lvp built in

Adding a protection on batteries is not free ! It costs some money, some space and even adds to self discharge and internal resistance so it make sense to add it only when it is really required.

I don't know who you mean exactly with "more expensive brands" but imho the big names like Sony, Sanyo, LG or Samsung don't include it because most of the batteries they sell are used in packs (think electric vehicles, power tools, laptop PC, ...) witch use a battery management system that already take care of lvp and several other things.

The market for batteries with individual protection is a very small one compared to what they are used to deal with and they seem to prefer letting smaller companies taking care of that (and buying their unprotected batteries Wink )

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That’s not what he is talking about.

He is only talking about LVP in lights, not cells.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

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None of the “Big 5” li-ion manufacturers produce any cells with protection circuits or button tops at all AFAIK.

But as for expensive lights without LVP, I can’t think of any except maybe Surefire, etc. that are made to run on only CR123s?

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I would have a question. If my understanding of the Li Ion cells manufacturing is correct, there is only handful of original OEM manufacturers like Samsung, LG, etc. Most cells on the market are rewrapped OEMs from these companies. Could someone fill me in on who are the manufacturers behind various Chinese brands of 18650 and 21700 cells then? Brands like Golisi, Liitokala, Lishen, Shockli and so. Do they run their own OEM factories beside the well known big manufacturers?

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Dioda wrote:
I would have a question. If my understanding of the Li Ion cells manufacturing is correct, there is only handful of original OEM manufacturers like Samsung, LG, etc. Most cells on the market are rewrapped OEMs from these companies. Could someone fill me in on who are the manufacturers behind various Chinese brands of 18650 and 21700 cells then? Brands like Golisi, Liitokala, Lishen, Shockli and so. Do they run their own OEM factories beside the well known big manufacturers?

The “Big 5” are Japanese manufacturers. LG, Samsung, Sony, Sanyo and Panasonic. Sanyo and Panasonic merged a few years ago so you sometimes see the same cell under either of those names.

There are a whole host of China based battery manufacturers, but they focus on wholesale production. They sell to other companies who focus on branding and marketing. Companies like Golisi, LiitoKala, Shockli, Keeppower, Efest, Orbtronic, Vapcell, etc… buy from various sources. Some come from the Big 5 and some come from unknown companies. This is why it’s important to know whats under the wrapper.

The only Chinese company I know of is Power Long Battery or PLB. They make the great 5500mah cell that measures about 5750mah and can do 20A continuous. It is resold by Shockli, Keeppower and Vapcell.

Most of these Chinese resellers will not tell you the company they buy their cells from. They try to keep it a secret. Sometimes they even switch the cells and keep the same wrapper.

Oh yeah, it’s quite known that the Big 5 have the best quality cells, do the highest testing and provide data sheets for their cells. The other brands don’t have quite the same standards. PLB published some info on their 5500mah cell, but it’s hard to find. Good luck finding data sheets for the others. Some are out there. Typically you can rely on tests by Mooch or HKJ.

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Dioda
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Thanks for confirming my thoughts. So better sticking with big 5 OEM, than playing lottery with unknown manufacturers under different wrappers. Too bad most of my sources dont sell the OEMs and European stores charge ridiculous shipping. Are there any reliable stores at Ali, that sell original 21700s (like 50E, 40T etc.)? I found some but the reviews are mixed.

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Dioda wrote:
Thanks for confirming my thoughts. So better sticking with big 5 OEM, than playing lottery with unknown manufacturers under different wrappers. Too bad most of my sources dont sell the OEMs and European stores charge ridiculous shipping. Are there any reliable stores at Ali, that sell original 21700s (like 50E, 40T etc.)? I found some but the reviews are mixed.

Aliexpress is like Ebay, a bunch of random stores that sell through the same website so you don’t really know what stores are legit and which are crooks. Some are known good and some you take a chance with. Lishen makes a good 4000mah 21700 and it can be found at Banggood under the LiitoKala brand. I’m not sure what cell is used for the LiitoKala 5000mah 21700.

Most of the Chinese stores like Aliexpress, Gearbest and Banggood sell the Chinese brand batteries. I guess it’s a lot cheaper than trying to import Japanese cells to China just to resell them.

What country are you in?

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Where to buy Mcpcb and led emitters wholesale or cheaper then buying say from kaidomain.com

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Natewar wrote:
Where to buy Mcpcb and led emitters wholesale or cheaper then buying say from kaidomain.com

Buying from China is cheapest, due to lower product cost and subsidized shipping. You need to buy a lot?

I typically buy from a USA store like MTN E. Costs a bit more, but faster shipping.

There are a lot of Chinese stores and their prices fluctuate. Kaidomain is definitely one of the better priced stores. Maybe someone can mention some more.

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I’m new to the flashlight world but have modded a few lights the only us stores that I know of are mtelectronics that sells LEDs and mcpcbs and illumi for batteries

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Illumn has PCBs and other goodies, I think. LEDSupply, too, for TIRs, etc.

Fasttech has a whole parts section for LEDs, drivers, reflectors, hosts, you name it.

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I plan on purchasing a ROT66 gen II, which batteries are recommended and where can I purchase them from?

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I've noticed a pattern of tiny holes in many driver boards, particularly in the traces.  What's the purpose of the holes?

 

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JasonWW wrote:
The “Big 5” are Japanese manufacturers. LG, Samsung, Sony, Sanyo and Panasonic. Sanyo and Panasonic merged a few years ago so you sometimes see the same cell under either of those names.

Sanyo and Panasonic merged, as you noted.
Sony was sold to Murata.
Molicel is a top player as well.

Yeah, the list is quite outdated when stated this way.

Maybe we should still be talking about the “Big 5” while meaning “LG, Samsung, Sony/Murata, Sanyo/Panasonic, Molicel”?

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Leddna has some MCPCBs and emitters as well.
Convoy has MCPCBs

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slmjim wrote:
I’ve noticed a pattern of tiny holes in many driver boards, particularly in the traces.  What’s the purpose of the holes?

They’re vias, plated-through holes to make a connection between the 2 sides.

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Lightbringer wrote:
slmjim wrote:
I've noticed a pattern of tiny holes in many driver boards, particularly in the traces.  What's the purpose of the holes?
They're vias, plated-through holes to make a connection between the 2 sides.

Got it.  Thanks!

 

slmjim

Great... Carnac the Magnificent tells me I just signed up for yet another expensive hobby.

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Agro wrote:
JasonWW wrote:
The “Big 5” are Japanese manufacturers. LG, Samsung, Sony, Sanyo and Panasonic. Sanyo and Panasonic merged a few years ago so you sometimes see the same cell under either of those names.

Sanyo and Panasonic merged, as you noted.
Sony was sold to Murata.
Molicel is a top player as well.

Yeah, the list is quite outdated when stated this way.

Maybe we should still be talking about the “Big 5” while meaning “LG, Samsung, Sony/Murata, Sanyo/Panasonic, Molicel”?


Yep, my info is old.

It seems Molicel has 2 plants, Taiwan and Canada.

Murata/Sony seem to have plants in Japan, China and Singapore.

Oh well, they are still cranking out the top notch products.

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