Reader9

joined 2 years ago
[–] Reader9@programming.dev 3 points 2 years ago (1 children)

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.

[–] Reader9@programming.dev 5 points 2 years ago (5 children)

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.

[–] Reader9@programming.dev 1 points 2 years ago

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.

[–] Reader9@programming.dev 1 points 2 years ago

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.

[–] Reader9@programming.dev 2 points 2 years ago

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.

[–] Reader9@programming.dev 2 points 2 years ago* (last edited 2 years ago)

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

[–] Reader9@programming.dev 1 points 2 years ago* (last edited 2 years ago) (1 children)

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.

[–] Reader9@programming.dev 1 points 2 years ago

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).

[–] Reader9@programming.dev 2 points 2 years ago

Thanks for these!

[–] Reader9@programming.dev 1 points 2 years ago* (last edited 2 years ago)

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.

[–] Reader9@programming.dev 2 points 2 years ago (2 children)

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!

[–] Reader9@programming.dev 4 points 2 years ago (1 children)

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.

 

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)

-1
submitted 2 years ago* (last edited 2 years ago) by Reader9@programming.dev to c/flashlight@lemmy.world
 

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:

Extra

1
submitted 2 years ago* (last edited 2 years ago) by Reader9@programming.dev to c/flashlight@lemmy.world
 

Two new SBT90.2 lights from Convoy

3x21D: 28 amps, 90.5mm head diameter

L21B: 18 amps, 62.6mm head diameter

view more: ‹ prev next ›