The There Are No Stupid Questions Thread

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Forsythe P. Jones
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I don’t see anything newer here, about the Iphone 13 and satellite communication. Did I miss something? I only scrolled back one page.

JasonWW
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Forsythe P. Jones wrote:
I don’t see anything newer here, about the Iphone 13 and satellite communication. Did I miss something? I only scrolled back one page.

Ming chi later clarified that the satellite use would be only for emergencies and only when there was no cell signal. It would not be a satellite phone.
Its all still rumors as there has been no official reports on the feature.

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xevious
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I’ve seen a lot of folks on BLF discussing LED and driver design, implementation, measurements, etc…. and it has me wondering how many of them are professionals like engineers or tradesmen who are in the industry and how many are just hobbyists/enthusiasts who have just learned via DIY. Anyone here have a feel for that?

Forsythe P. Jones
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Quote:

Ming chi later clarified that the satellite use would be only for emergencies and only when there was no cell signal. It would not be a satellite phone.
Ok, this sounds like a PLB and I guess it makes some sense. Too bad they can no longer use the headphone cord as an antenna, since they got rid of the headphone jack…
JasonWW
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xevious wrote:
I’ve seen a lot of folks on BLF discussing LED and driver design, implementation, measurements, etc…. and it has me wondering how many of them are professionals like engineers or tradesmen who are in the industry and how many are just hobbyists/enthusiasts who have just learned via DIY. Anyone here have a feel for that?

Some like Barkuti and Tom E used to work as engineers for big electronics companies and Lexel trained as an electronics engineer. Toykeeper was a software coder.
I think the flashlight specific field is too small and specific so you get these knowledgeable people from larger adjacent fields who like flashlights that find it easy to learn driver design and firmware coding. I’m pretty sure 99% of the forum members just pick up things here and there and get a good feel for it. The number of people that can design their own driver is quite small. Maybe 10 or 15 people? Maybe 20?
Anyway, thats my guess.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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anonymous_user
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Is there a good place to buy lens (sans AR coating) for Convoy flashlights? I’d rather skip the work of manually scrubbing my lens clean.

xevious
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JasonWW wrote:
Some like Barkuti and Tom E used to work as engineers for big electronics companies and Lexel trained as an electronics engineer. Toykeeper was a software coder.
I think the flashlight specific field is too small and specific so you get these knowledgeable people from larger adjacent fields who like flashlights that find it easy to learn driver design and firmware coding. I’m pretty sure 99% of the forum members just pick up things here and there and get a good feel for it. The number of people that can design their own driver is quite small. Maybe 10 or 15 people? Maybe 20?
Anyway, thats my guess.
Thanks, Jason! I was hoping you might reveal some good stuff. I’m psyched to know that we’ve got some real domain experts in our midst, even if they’re retired. Their knowledge is really impressive. It does seem like a wonderful hobby born of professional experience for such folks. Using your trade know-how and wisdom for a personal passion… nothing much else quite like it! These people and the diehard hobbyists who are learning and sharing are making this hobby so fascinating. And the small time flashlight makers keeping an eye out are learning from all this. Real “test subjects” taking their product, running it through paces using professional insight & discretion… it’s basically free QA for just the cost of a flashlight. Not a bad deal!
Lightbringer
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anonymous_user wrote:
Is there a good place to buy lens (sans AR coating) for Convoy flashlights? I’d rather skip the work of manually scrubbing my lens clean.

20mm plain glass? I got a bunch from AX in various sizes, just gotta look.

Eg, for my LuxPro lights, I measured the plastic “glass” in front, say, 43mm. Then just search on AX and see what’s out there, whether 2mm or 3mm thick, coated or not, etc., and just grab it.

For these, 20mm should fit, but you might wanna confirm that it’s not, say, 21mm or so.

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lionheart_2281
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JasonWW wrote:
Forsythe P. Jones wrote:
I don’t see anything newer here, about the Iphone 13 and satellite communication. Did I miss something? I only scrolled back one page.
Ming chi later clarified that the satellite use would be only for emergencies and only when there was no cell signal. It would not be a satellite phone. Its all still rumors as there has been no official reports on the feature.

000 and 112 worked from my iPhone 8 when I was many many kms away from any type of reception (when I got lost in the mountains)

edit: Triple 0 or 000 is the same as 911 in USA

story
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I have a D4V2 TI 219B 3500k and a D4V2 sand 219B 4500k.
Can I switch/swap the whole driver, led easily?

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I wouldn’t say easy, you have to deal with this wire mess

It’s really tight, I don’t get why they don’t use thinner wires for the aux LEDs.

story
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thefreeman wrote:
I wouldn’t say easy, you have to deal with this wire mess

It’s really tight, I don’t get why they don’t use thinner wires for the aux LEDs.

Ah I was hoping it was easy. I found TI too heavy.

Forsythe P. Jones
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Is it difficult to transplant the electronics from one d4v2 into another, if I don’t want to mess with the wiring, i.e. don’t need to separate the driver board from the MCPCB? That does leave the matter of the pushbutton.

Reason for doing this: I am sort of wanting a d4v2 with cyan main leds, so obviously it should be in a cyan tube. But my white led one is already in a cyan tube. So I’d want to get the cyan-led light in another color, then switch the tubes around.

CRC
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Why silicone grease?

Everytime I read about greasing the threads on a flashlight it always specifies ‘silicone’ grease/lube

Any reason I would have to use something silicone based to lube my threads?

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Compatibility with the O-rings. Best to not let them turn to pudding.

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CRC
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So, probably best not to just use the trailer grease I happen to already have?

thefreeman
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Forsythe P. Jones wrote:
Is it difficult to transplant the electronics from one d4v2 into another, if I don’t want to mess with the wiring, i.e. don’t need to separate the driver board from the MCPCB? That does leave the matter of the pushbutton.

Reason for doing this: I am sort of wanting a d4v2 with cyan main leds, so obviously it should be in a cyan tube. But my white led one is already in a cyan tube. So I’d want to get the cyan-led light in another color, then switch the tubes around.

No you have to desolder the wires, otherwise you can take out anything.

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CRC wrote:
So, probably best not to just use the trailer grease I happen to already have?

If you got a squeaky trailer, by all means use it on that, but…

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story
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I have Wurkkos WK30 with the red / uv / LH351D and I have a S2+ KB CSLNM1.14 blue light

Based on the specs, can I swap the S2+ blue led with the LH351D?
The WK30 turbo is 3.2A vs 5A for S2+.

mitsuki08
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Can I use toothpaste to remove AR coating on lens?

xevious
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CRC wrote:
Why silicone grease?

Everytime I read about greasing the threads on a flashlight it always specifies ‘silicone’ grease/lube

Any reason I would have to use something silicone based to lube my threads?

It doesn’t have to be strictly silicone, but you should avoid using motor oil, petroleum jelly, or lithium grease.

Here’s a useful page over on CPF that identifies excellent, very good, fair, and poor choices in lubes for flashlights: LINK.

I bought a small 1oz tube of Nyogel about 10 years ago. I’ve not even gone through half of it. Great stuff. I also have “Magic Lube II” which is actually a silicone lubricant. You’re not supposed to use silicone grease on silicone o-rings. The black ones tend to be rubber, while the clear/white ones tend to be silicone. I’ve used that lubricant and had no problems.

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story wrote:
I have Wurkkos WK30 with the red / uv / LH351D and I have a S2+ KB CSLNM1.14 blue light

Based on the specs, can I swap the S2+ blue led with the LH351D?
The WK30 turbo is 3.2A vs 5A for S2+.

It should be possible but with 3A it will not be as bright as with 5A. The NM1 has a 3030 footprint so it will not be a direct swap with the LH351D which is 3535. I don’t know if a 16mm MCPCB fits the WK30 or if it uses a custom MCPCB.

story
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Skylight wrote:
story wrote:
I have Wurkkos WK30 with the red / uv / LH351D and I have a S2+ KB CSLNM1.14 blue light

Based on the specs, can I swap the S2+ blue led with the LH351D?
The WK30 turbo is 3.2A vs 5A for S2+.

It should be possible but with 3A it will not be as bright as with 5A. The NM1 has a 3030 footprint so it will not be a direct swap with the LH351D which is 3535. I don’t know if a 16mm MCPCB fits the WK30 or if it uses a custom MCPCB.

Thanks, I won’t go ahead of this. I might just slice the dome.

story
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I would like to drill a 1/4” hole on the Sofirn SP36.
Can someone link me the tool that will create the threads? It’s so shallow I don’t want to buy the wrong ones.

Forsythe P. Jones
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I don’t see how to do that without punching through the light. Just buy a 1/4”×25 hex nut and epoxy it onto the light, I would say.

CRC
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Im thinking of grabbing a Sofirn SC31 Pro on sale right now.

Can anyone tell me why the sofirn aliexpress store has multiple listings for the sc31 pro?

Thyre all roughly the same price.

https://www.aliexpress.com/item/4001316732888.html?spm=a2g0o.store_pc_gr...

https://www.aliexpress.com/item/1005001337803376.html?spm=a2g0o.store_pc...

https://www.aliexpress.com/item/1005002848754443.html?spm=a2g0o.store_pc...

Whatever the reason. Im thinking I should probably order from the first link?

Edit: Or I can order it here

https://sofirnlight.myshoplaza.com/products/blackbluegreen-sofirn-sc31-p...

This will be my first Sofirn purchase. Need some direction please

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I have one question for veteran Flashoholics: When is the best annual sale of flashlights?

Could it be on 1 October, the Chinese National Day, since most sellers (including Banggood and Ali Express) are Chinese, or during the Black Friday (26 November), or during the year-end holidays, from Christmas until New Year Day?

I am asking because I am saving all I can to buy a few “big ones” during the biggest sale.

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TermsakC wrote:

I have one question for veteran Flashoholics: When is the best annual sale of flashlights?

For AliExpress and some other Chinese web shops, it's Single's Day, or 11/11.

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Thanks Raccoon City. Noted. Will keep any eye on the 11/11 Sale. Innocent

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story wrote:
I would like to drill a 1/4" hole on the Sofirn SP36. Can someone link me the tool that will create the threads? It's so shallow I don't want to buy the wrong ones.


Where on the light are you wanting to drill?  (and why...?) 

The tool you want is called a tap and there are lots of different kinds of them (thread sizes and types, a few other things).  You need a) to have enough metal to cut threads into, which is hard on most flashlight bodies other than around the meat of the head usually), and b) to know what size tap/thread you are using and to pick the correct size drill based on that tap size (very important!).  Don't drill a hole and then hope the tap works because that's backwards.  Smile  


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