phasetransition

Thumbs up everything about this product. I just started a side project that has minimal interface goals for a low(er) tech use case, and this is lovely.

N=1 story of great childhood cat: he was a Russian blue, which I later came to understand as a particularly smart and affectionate breed.

He would come like a dog, knew many words like "peanut butter," was very clever at opening and closing all manner of doors, and was very affectionate, if you were the only one around.

Literally would grab your ankles and try to restrain you from leaving. But only if you were the only one around.

Incredible sense of spatial awareness and time of day, too. Both seem common traits to cats.

The cost vs the Manhattan project as a drain on German resources is one of the major thesis points in "The Rocket and the Reich."

Reminds me of an experiment in my undergraduate glass lab. Take soda-lime stirring rods and break 50 or so under 4 point bend test. Record strength.

Take another batch and simply log-roll them along the lab bench for half a meter. Repeat break test. Note the reduction in strength signficant at p=0.05 .

Fracture toughness is a bear.

:-) true enough, and I'll take you up on that.

Especially if you sold a wireless mesh company and know a guy named Eric from your GT days who recently changed jobs from one consultancy to another...

Wait. I think I am supposed to grab lunch with you through our mutual friend Eric S. Does this sound familiar?

Carvers, Bobby and June's, and cuban sandwiches in my Georgia Tech days.

I am aware :-)

See ISO 226:2003

Minor pedantry: 10log(6/100) = -12.2, so you could sort of get the number stated if you assume they meant sound power.

These metamerial, interference based approaches, are not going to be broadband by the standards of physical acoustics.

This could be useful for helping cancel a particular harmonic of a helmholtz resonator.

The real question, to me, is does it still work at high transitional Reynolds numbers, or under full turbulent flow?

Source: End effects during transitional and turbulent flow for Helmholtz resonators (i.e. bass reflex ports) in high output pro-sound loudspeakers has been something I've played around with in the past.

You could also add the asymmetrical waveshape of the "blat" of several types of horn instruments (e.g. trombone) to that list of similar tones.

Generally I would agree that if you exercise this muscle, it can be hard to turn off.

There's still a lot of room for art in the process, though. With experience you get less attached to your particular sonic leitmotifs, and that helps. Even if you would not personally mix it the same way.

I'm not speaking of the sensor, but rather the meat computer interpreting it.

Things you can train for include: being sensitive to minute changes in level/frequency/time, picking one source out of many, precisely placing items spatially in stereo, listening for specific types of audio artifacts.

Golden ears could include perfect pitch, but in the production context pp might be translated to a specific frequency, rather than a note.

As someone who has nearly two decades moonlighting experience as a live sound mixer, stories like this remain a reminder at how bad humans are in general at hearing.

These two instruments are both great, but the Hammond is no analog for a pipe organ. Neither in tone nor the way it interacts with room acoustics. It's fascinating that this could even be a plausible discussion.

You can improve your hearing markedly with practice. I didn't start with "golden ears" but have improved a great deal even as my ears age. But many of my worst days behind a mixing desk got the most positive response from the general audience.

This is not the case with Delta. Delta techops is one of the world's largest airplane repair organizations

Agreed 100% on AgentJayZ

I'm not sure for high CRI. See my comments elsewhere about Ikea otherwise.

Any bulb with switch mode hardware to control the LED drive current will exhibit RF emissions.

The cheaper bulb in the original article has linear current control. Inside the ASIC, this could be as simple as a BJT or FET in saturation with a (somewhat) controlled base/gate voltage, maybe with some temperature compensation.

The linearly regulated bulb will have less RF emissions, though you could theoretically still have a bit of rf trash from edge effects depending on the rectifier and filter cap.

Any bulb that has passed FCC Class B will have an upper bound on conducted and radiated emissions, but you can pass such tests on a wide range of margins, and therefore certification isn't useful to clarify which bulbs have the lowest emissions.

Leedarson is an OEM for many light bulbs you've seen on shelves in stores.

The higher end line (Ledare?)

Can't speak to any of that. The appearance to me as a consumer walking around with an engineering eye, is that the early days of expensive higher end, store exclusive home LED bulbs (e.g. Cree at Home Depot) has given away to an all out price war.

As above, look for architectural bulbs that are deep dimming rated (< 10% dimming). They cost more. I personally have had good luck with Cree, but probably the other top shelf vendors have similarly good products.

There's a myriad reasons why flicker and buzz occur, because there are a number of ways to achieve dimming. But all of this comes down to cost.

If dimming is important to you, there are a number of architectural grade bulbs that offer deep dimming to 5% or 1%.

Personally, for this application, I've had good luck with Cree bulbs of this type at home (on Leviton dimmers). And in the house of worship environment with Cree bulbs on Doug Fleenor dimmers (http://www.dfd.com/dmx8dim.html)

We've certainly been asked about amber LEDs for coastal environment projects, so I think there is some demand. Amber LED performance, on the other hand, is a different story.

The lumens out of a legacy high pressure sodium lamp are very high. It is still an engineering challenge to get comparable lumens out of LEDs at price point the market will bear.

I can only guess that the marketing department wanted to put the biggest numbers forward against what was plausible calculations for the early LED lifetimes.

I know for a fact that some of the testing houses have done extended on/off cycle testing for some of the big box retailers looking to keep the lamp vendors honest on real lifetime performance of A19 class bulbs. I've been in such a test chamber.

It has nothing to do with this. It has to do with details about the OEM for the Ikea product.

All bulbs produce heat, both from the LEDs and the electronics. Incandescent bulbs were blazing hot, too, and they radiated IR on top everything else.

A high efficiency LED assembly is still producing on the order of 50% light and 50% heat.

I cannot speak knowledgeably to this for A19 type products, but generally there is no need to have such low temperatures to achieve good lifetimes. There may be temperature requirements this low for bulbs mounted in certain locations, but that is not a part of UL 1598 that I have in my brain.

None. Our industrial customers require minimum 5 year warranty at 12hrs on per day, 365 days per year. We work hard to make both the lighting producing and mechanical aspect of the luminaires last.

0% We do outdoor lighting for industrial environments

For LEDs, LM-80 data is used to extrapolate lifetime data via the TM-21-11 methodology. Its not great, but it is what we have. If you read the standard, it has pretty good summary of the drawbacks of the current approach to lifetime extrapolation:

https://www.ies.org/product/projecting-long-term-lumen-maint...

But, in practice, other components generally fail before the LEDs have a (binary) failure.