flashlight
Finding something better (for me) than the Fenix LD02
Reader9 11 months ago • 100%
If you’re willing to try Aliexpress, Convoy offers a cheap twistable AAA light with a basic low CRI emitter in three color temps for under $10. It’s better than other twist lights I’ve used like because both “on” and “off” are tightly secured to the body so the light won’t fall apart or turn itself on.
flashlight
Recently convinced my dad to buy his first Hanklight. I'm doing my part!
Reader9 12 months ago • 100%
Just to add to the other great response, the “D2” pictured above is configured with one ultraviolet emitter and one “deep” red emitter which is not an easy combination to find. And there is a wide range of emitters to choose from based on preference.
flashlight
[@flashlight](https://lemmy.world/c/flashlight) I may have overheated my brass TS10. The battery wrap shrank.
Reader9 12 months ago • 100%
Toykeeper herself confirmed that the strobes have no thermal regulation.
As of 2023-10, only the ramp mode has thermal regulation
flashlight
Driving Engagement?
Reader9 12 months ago • 100%
Thanks for posting this. Additionally, I think highlighting some great posts in the sidebar like @containerfan@lemmy.world ’s Anduril diagrms https://lemmy.world/post/1038159 would be great since it shows what’s unique about this small community (on Lemmy).
flashlight
Do alkaleaks hold up better in the fridge?
Reader9 12 months ago • 100%
Moisture could be a problem, found this manufacturer faq:
Energizer Non-Rechargeable Batteries: Frequently Asked Questions Is it a good idea to store batteries in a refrigerator or freezer? No, storage in a refrigerator or freezer is not required or recommended for batteries produced today. Cold temperature storage can in fact harm batteries if condensation results in corroded contacts or label or seal damage due to extreme temperature storage
flashlight
Convoy Design Concepts with 50mm TIR
Reader9 12 months ago • 100%
Simon mentioned these represent 3 lights, hopefully including a single-cell mechanical switch light. There appears to be one e-switch single-cell with charging, and unclear if the 2-cell has tail, electronic, or both.
Repost from [BLF](https://budgetlightforum.com/t/convoy-s21e-519a-anduril-1-0-available-now/54654/10490 ) to share these future flashlight designs. There isn’t too much content like this out there that I’m aware of but it’s fascinating to me.   Bonus 90mm TIR: 
flashlight
Best Pocket Throwers?
Reader9 12 months ago • 100%
This s6 config is awesome value and I don’t think you’ll be disappointed, especially running in 18350 mode.
Found this beamshot on the other site but I can also say from personal experience that theres a nicely defined hotspot for a tube light.
Fiction Books
The best new science fiction books of October 2023
flashlight
Best Pocket Throwers?
Reader9 12 months ago • 100%
I also still like the older Thrunite catapult v1 which preceded Wurkkos’s ts11. It has reasonable output and good runtime for its size, but ts11 can be found for cheaper and has anduril and aux with a possibly slightly worse driver.
flashlight
Best Pocket Throwers?
Reader9 12 months ago • 100%
How about Mankerlight MC13 II with SBT90.2 ($110 USD) emitter or sft40 ($65)?
http://mankerlight.com/mankerlight-mc13-ii-90-2/
It’s a larger 18350 light that twists open to 18650. The TIR is similar to Thrunite Catapult v1 and possibly Wurkkos ts11.
.
A 21700 tube was also released as part of a bundle or here: https://www.killzoneflashlights.com/products/manker-21700-tube-for-mc13-ii-e14-iv.
I don’t have this light but it seems like OK value for the higher price (for very short bursts of throw, not sustained).
Programming
Lemmy 0.19 updates
Reader9 12 months ago • 100%
Agreed. My copy lost this documentation link in the original which gives more detail about the horizontal scaling: https://join-lemmy.org/docs/administration/horizontal_scaling.html.
It seems really straightforward (which is a good thing), each backend Lemmy_server handles incoming requests and also pulls from a shared queue of other federation work.
Programming
Lemmy 0.19 updates
Reader9 12 months ago • 100%
Time zones are an endless source of frustration, this one doesn’t sound too bad though:
Going forward, all timestamps in the API are switching from timestamps without time zone (
2023-09-27T12:29:59.113132) toISO8601timestamps (e.g.2023-10-29T15:10:51.557399+01:00orZsuffix). In order to be compatible with both 0.18 and 0.19, parse the timestamp asISO8601and add aZsuffix if it fails (for older versions).
https://programming.dev/post/3666732 Change log for upcoming Lemmy version 0.19.0 I am just reposting this from the original post: https://lemmy.ml/post/5711722. It’s interesting to see this for the software we’re all using and it makes me want to learn a bit more about the architecture. Quite a few user-facing features and some backend improvements. For example: > Outgoing Federation Queue The federation queue has been rewritten to be much more performant and reliable. This is irrelevant for client developers, but admins should look out for potential federation problems. If you run multiple Lemmy backends for horizontal scaling, be sure to read the updated documentation and set the new configuration parameters. The Troubleshooting section has information about how to find out the state of the federation queues. > https://github.com/LemmyNet/lemmy/pull/3605
flashlight
10 hours until ~~Brushed~~ Titanium Ts10 with RGB
Reader9 12 months ago • 100%
Oh sorry I mixed that up, the Wurkkos rep called it “bead-blasted” but that sounds more like stonewashed than brushed.
There were also some alternate finishes for the previews, maybe one will make it into production.
flashlight
10 hours until ~~Brushed~~ Titanium Ts10 with RGB
Reader9 12 months ago • 100%
Real RGB? Does this mean we can now control the color?
That’s right, check out https://lemmy.world/post/3287635 for some pics.
I was confused about the engraving but I like your idea to ask for “no engraving” as the option. Only the first 30 get a custom one so maybe everyone else will have the logo engraving.
Who’s getting one? 
flashlight
Problem finding flashlights for camping...
Reader9 1 year ago • 100%
Olight Obulb looks good for kids. Max 55 lumens and sustains close to that for 3 hours (review), waterproof and with a kid-friendly appearance. $20 on amazon currently.
These don’t provide much illumination but the Niteize rechargeable glow sticks are good kid lights too.
Interesting [post](https://budgetlightforum.com/t/new-upgrade-designs-for-wurkkos-ts25-which-one-would-you-prefer/220096) from the designer of the ts10 (I think) about potential new body styles of the next-generation ts25. Bonus comment with good news > Wurkkos Terry: Got it my man. I can feel that the higher and higher voice of regulated driver. We are constantly increasing the regulated models.
flashlight
Convoy T3: Almost perfect semi-custom EDC flashlight
Reader9 1 year ago • 100%
replaceable
This is a big part of why I like Convoy, they’re relatively inexpensive enough to have a few backups for the inevitable ones that get lost.
Data Engineering
Bloom filters: real-world applications
Reader9 1 year ago • 100%
I can see why this data structure might be abused and/or chosen for an inappropriate use-case since it seems to offer a lot of value for the tiny amount of space required.
if you need to know a key is definitely in that space. You still have to perform the lookup.
This is a good description. I think the name “filter” is appropriate for their best use cases, when you want to remove members of some other set if they are probably members of the bloom filter set, and can accept that you might remove some extras due to false positives.
Problems like that come up from time-to-time.
Programming
Bloom filters: real-world applications
Reader9 1 year ago • 100%
This data structure uses a 2-dimensional array to store data, documented in this scala implementation: https://github.com/twitter/algebird/blob/develop/algebird-core/src/main/scala/com/twitter/algebird/CountMinSketch.scala. I’m still trying to understand it as well.
Similar to your idea, I had thought that by using k bloom filters, each with their own hash function and bit array, one could store an approximate count up to k for each key, which also might be wasteful or a naïve solution.
PDF link: http://www.eecs.harvard.edu/~michaelm/CS222/countmin.pdf
flashlight
Collection so far. At least until my package gets here
Reader9 1 year ago • 100%
ts12
Late reply but now I realize they should have just made a 14500 version of the ts11, even without aux sft40 or W1 would have been neat with this host.
flashlight
[@flashlight](https://lemmy.world/c/flashlight) I may have overheated my brass TS10. The battery wrap shrank.
Reader9 1 year ago • 100%
Been looking for a primary source but the manual doesn’t specifically mention candle mode, only tactical strobe
- Tactical strobe Disorienting strobe light. Can be used to irritate people. Speed is configurable, and the duty cycle is always 33%. Be careful about heat in this mode, if using it for a long time.
And then other places people mention this also applies to candle mode (like this BLF post).
flashlight
FW1A Titanium w/ SFT40 3000k and RGB Aux
Reader9 1 year ago • 100%
Thanks for these!
Programming
Bloom filters: real-world applications
Reader9 1 year ago • 100%
I haven’t used them in Spark directly but here’s how they are used for computing sparse joins in a similar data processing framework:
Let’s say you want to join some data “tables” A and B. When B has many more unique keys than are present in A, computing “A inner join B” would require lots of shuffling if B, including those extra keys.
Knowing this, you can add a step before the join to compute a bloom filter of the keys in A, then apply the filter to B. Now the join from A to B-filtered only considers relevant keys from B, hopefully now with much less total computation than the original join.
Programming
Bloom filters: real-world applications
Reader9 1 year ago • 100%
Collage sounds really interesting , will check it out. Another variation on bloom filter I recently learned about is count-min-sketch. It allows for storing/incrementing a count along with each key, and can answer “probably in set with count greater than _”, “definitely not in set”.
Thanks for adding more detail on the DB use-cases!
cross-posted from: https://programming.dev/post/2656516 > What are your real-world applications of this versatile data structure? > > They are useful for optimization in databases like sqlite and query engines like apache spark. Application developers can use them as concise representations of user data for filtering previously seen items. > > The linked site gives a short introduction to bloom filters along with some links to further reading: > > A Bloom filter is a data structure designed to tell you, rapidly and memory-efficiently, whether an element is present in a set. > > The price paid for this efficiency is that a Bloom filter is a probabilistic data structure: it tells us that the element either definitely is not in the set or may be in the set.
flashlight
[Review] Cyansky HS7R – dual channel 21700 headlamp
Reader9 1 year ago • 100%
A more focused throw channel with the same color temperature as the flood channel would be great.
Sft-70 is 6 volt right? Otherwise this would seem like the perfect spot for an sft-40 3000k.
What are your real-world applications of this versatile data structure? They are useful for optimization in databases like sqlite and query engines like apache spark. Application developers can use them as concise representations of user data for filtering previously seen items. The linked site gives a short introduction to bloom filters along with some links to further reading: > A Bloom filter is a data structure designed to tell you, rapidly and memory-efficiently, whether an element is present in a set. > The price paid for this efficiency is that a Bloom filter is a probabilistic data structure: it tells us that the element either definitely is not in the set or may be in the set.
flashlight
Collection so far. At least until my package gets here
Reader9 1 year ago • 100%
Well yes, but this is an internet forum for flashlights. That’s pretty weird too.
flashlight
Collection so far. At least until my package gets here
Reader9 1 year ago • 100%
Thanks! I’ve seen some of your great posts and LED swap mods on BLF. These are well-photographed, something which is more difficult than I realized once I tried taking some photos of lights, with phones being so good now at taking pics of people and landscapes.
I do have a ts10 in the rotation (plus two extras from when Terry from Wurkkos said the anodized colors were being discontinued) and it is as good as everyone says, although I only like it in 5700k.
Ask Electronics
Replacement Bulb for Ultrafire WF-500 Flashlight
Reader9 1 year ago • 100%
The reflector of the flashlight is built so light coming from a very small source (like the filament of an incandescent bulb) is directed forward in a focused beam.
I agree, but I also think that using a modern LED with a single source of forward-facing light is fine. However the emitter would need to be properly positioned in the light.
Here’s a very similar host (from one of the best low-cost flashlight makers) showing a properly aligned LED and reflector:
Product link: https://www.aliexpress.us/item/3256801849471618.html
Ask Electronics
Replacement Bulb for Ultrafire WF-500 Flashlight
Reader9 1 year ago • 100%
I found a few references to this exact model on candlepowerforums.com which I believe has more folks who own(ed) incandescent lights. Not that has been such a long time, but LED technology advanced very quickly. Not sure if that will help your search.
There’s also a few people over on !flashlight@lemmy.world !
flashlight
Collection so far. At least until my package gets here
Reader9 1 year ago • 100%
Not only a great review(er) but the website does not have intrusive ads, thanks @TacGriz@lemmy.world!
flashlight
Collection so far. At least until my package gets here
Reader9 1 year ago • 100%
Ah in that case I answered your question accidentally haha.
I haven’t heard of IR emitters in the D2, but if anyone could do it it would be Hank Wang (the owner of Emisar and Noctigon).
flashlight
E75 at work today.
Reader9 1 year ago • 100%
Now on sale for $70 at the acebeam website (code NEWEDC30). I saw this on the other site 😓 )
flashlight
Collection so far. At least until my package gets here
Reader9 1 year ago • 100%
Emisar D2 can be ordered with UV on the second emitter. Pictured 2nd and 4th from bottom left in OP’s photo but those all look like visible light emitters.
It’s a much smaller brand than Olight so keep that in mind if you’re looking for something with more mass market appeal.
3DPrinting
I Made Gandalf's Staff With a Face Melting Flashlight
Reader9 1 year ago • 100%
@Spicy3d@lemmy.world check out this diffuser!
flashlight
Collection so far. At least until my package gets here
Reader9 1 year ago • 100%
I can see you like Anduril! Except for the wurkkos ts12.
How do you like the brass ts10? Seems like a great value and is on my list to potentially get.
Sticking with the 14500-theme, my first hank light might be a D2 if I can settle on an emitter combo.
3DPrinting
I Made Gandalf's Staff With a Face Melting Flashlight
Reader9 1 year ago • 100%
Cool project and post! There’s also !flashlight@lemmy.world if you’d like to cross post.
gets hot enough to burn you if you leave it on for too long
That Fenix looks like a reliable light and is designed with temperature regulation but the limit might be pretty high and of course it is being used in an enclosure.
flashlight
Convoy M21H (XHP70.3 HI) Flashlight Review
Reader9 1 year ago • 100%
Wow you are absolutely right, in another browser I saw multiple pop-overs and tons of repeated ads.
I’ve edited the post to point to a different reviewer. Convoy certainly doesn’t do any advertising themselves so I think they fit well on Lemmy.
flashlight
Convoy M21H (XHP70.3 HI) Flashlight Review
Reader9 1 year ago • 100%
Sorry @xenspidey@lemmy.zip ! I did not see any because I was using an ad blocker but I didn’t intend to spam. I do think this reviewer is worth reading and (with apologies to Mr Zeroair) blocking the ads if possible.
flashlight
Convoy M21H (XHP70.3 HI) Flashlight Review
Reader9 1 year ago • 100%
Still has the (sub-)standard Convoy e-switch ui, but the “1%-10%-40%-100%” mode works for me.
darrenyeo.com
Updated link from https://zeroair.org/2023/08/28/convoy-m21h-flashlight-review/ to https://darrenyeo.com/convoy-m21h-xhp70-3-hi-flashlight-review-best-budget-pocket-rocket/ since the former had some pretty aggressive ads (the new link has some but they were only at the top).
flashlight
Comparing the 3D beam shapes (and not a side projection on a wall) of the 1 LED + SMO Nitecore MT21C vs the 3 LED + TIR optics of Wurkkos TS10s (4000 K and 3000 K). Using soapy water in a white tub. [
Reader9 1 year ago • 100%
This should be the new standard beamshot for diving lights though!
flashlight
FW1A Titanium w/ SFT40 3000k and RGB Aux
Reader9 1 year ago • 100%
Convoy is a personal favorite brand for single-cell mechanical switch lights. I’ve been comparing an s2+ with 18350 vs T3 with 14500, and T3 is my preference as a daily light. So why is the T3 so great? It’s large for a 14500 but also durable and it has an elongated shape (21mm x 97mm) more similar to larger lights than the short s2+ (24mm x 84mm). Just like the s2+, it’s semi-custom in that the customer can choose from a few LEDs and in the case of the popular 519a choose a color temp from 2700k-5700k. Plus Convoy now offers these lights with MAO or in copper (coated for the T3) or titanium (linked) for more consumer choice direct from the factory. The biggest downside of the T3 and the reason I keep trying to like short s2+ is the T3 **driver**. With a limit of 1.5 amps with a 14500, this is only 30% as powerful as the standard s2+ 5 amp driver. That’s still very useable with a 519a, but if it were bumped up to about 2.5 amps I think it would be even better. The driver itself has great reviews and regulates the output such that brightness does not immediately decrease with voltage. And for the DIY-capable, the driver is the same size as s2+’s so it has the potential to be just as powerful. So far I have aluminum T3s in sst-20 deep red and 519a 3000k plus a broken 219b 3500k. Did I mention these start at $15??
Anyone else using Hollow (written by Netflix) in production? > Hollow is a java library and toolset for disseminating in-memory datasets from a single producer to many consumers for high performance read-only access.
This novella fits well under the larger umbrella of speculative fiction I think. It feels like magical realism with a touch of science fiction and having fairy tale elements. I also enjoyed [Noor](https://nnedi.com/books/noor/) and I plan to check out the author’s [Binti](https://nnedi.com/books/the-binti-series/) trilogy. Would recommend checking one of these out for something a little bit different!
Edited: previously linked to https://www.sofirnlight.com/products/sofirn-if30-edc-powerful-flashlight?spm=..collection_eea4d417-4338-4a86-ba3e-1a41b66cb32b.collection_detail_1.1, replaced with an image for better Lemmy preview. Something new from Sofirn. These larger cells (than 26800) seem to be popping up in flashlights more often now. This one lists 6500 mAh which isn't a much bigger capacity but presumably the maximum discharge must be pretty high to support 12000 lumens. Sft-40 in the center surrounded by flood emitters. This isn’t one I’ll be picking up, maybe I’ll hold out for a 461000 cell!
Throwing Rocks: Without spoiling the plot, what are some good books that involve the threat of weaponizing a planet’s gravity well against its population? Please if possible don’t specify whether the event actually happens in the book to keep it a mystery.
cross-posted from: https://literature.cafe/post/270743 !fiction@literature.cafe > I have been reading the English translations and the characters and especially their dialogues feel very fake. I do appreciate the hard science aspect of the books but the long monologues, kids speaking like middle-aged philosophers, and army personnel being one-dimensional macho men breaks the immersion for me. It has the depth of a 1980s low-budget thriller. > > I don’t read a lot of hard science fiction or translations of Chinese books. I don’t know if this is genre-related.
This article helped defined the “data engineer” role so I’d say it belongs here! Although some time has passed, I find it very relevant: SQL is used more than ever, graphical ETL tools that don’t output code are rare and vendors are still trying to convince executives to trust all their data to proprietary data warehouses. The author Maxime Beauchemin also wrote Airflow and Superset so they have some experience worth listening to.
There are some great posts by experienced modders here. I’m not one, but I want to start making simple modifications beyond swapping reflectors. For example, swapping out a 5a linear driver for a 5a buck in a Convoy S6. For a simple job like unsoldering two wires then soldering them, is there a small usb or battery-powered iron that would do the job without spending too much on the initial investment? Any input is appreciated!
A few small lights I had around. The hs10 gets a lot of use as a night light and the ts10 is carried the most right now. Never really used the s21d in this form but it’s very compact! Left-to-right: Sofirn hs10 16340 2700k Wurkkos ts10 14500 5700k Sofirn sc21 16340 4000k Acebeam Pokelit AA/14500 5000k Sofirn sp10 pro AA/14500 Convoy s21d 18350 2700k (with Wurkkos 20350 tube and tail cap)
Three Convoy lights with 8A buck drivers for getting the most runtime out of 21700 size batteries. Purchased for $28-$38 each with batteries included I think these are an incredible value.  *white balance is not consistent M21B with SFT40:  S21D with four 519A 2700k emitters and 60 degree beaded TIR:  S21B with Osram CULPM1:  
How about adding some links in the sidebar for basic flashlight resources? Some links are provided when clicking-through to the pinned “arbitrary list” post 🙏but they could also be linked directly from this community. What other sites ought to hbe included (if any!)? ## Tools • [Parametrek Flashlight Search](http://flashlights.parametrek.com/): A supercharged flashlight database. “Start with an expansive catalog and provide parameters that you are looking for (or are avoiding)” • [Budget Light Forum](https://budgetlightforum.com/): Established English-language forum. “Where Frugal meets with Flashlight!” • [Flashlight Review Database](http://lumireviews.ca/) • [CamelCamelCamel](https://camelcamelcamel.com/): free Amazon price tracker (via https://lemmy.world/post/1049623) ## Buying Guides • [Arbitrary List of Popular Lights](https://zakreviews.com/arbitrary-list-2023.1.html) • [Grizzly’s Convoy Guide](https://tgreviews.com/grizzlys-convoy-guide/)
Two new SBT90.2 lights from Convoy [3x21D](https://m.aliexpress.us/item/3256805577865209.html): 28 amps, 90.5mm head diameter [L21B](https://m.aliexpress.us/item/3256805578110384.html): 18 amps, 62.6mm head diameter