General > General Technical Chat
why is the US not Metric
Monkeh:
--- Quote from: vad on October 26, 2019, 10:24:05 pm ---Unfortunately, I still have to come across AC-powered A19 LED bulb that can work reliably in fully-enclosed or semi-enclosed luminaries (up to promised 25,000+ hours MTBF, without thermal intermittent shutdowns or bricking itself). And I still have to come across AC-powered A19 LED bulb that can dim properly.
--- End quote ---
I'll show you again for the hard of seeing:
It's tiny, it's SELV, it's efficient (okay I haven't measured it), it's cheap, it uses existing reasonably sized distribution, and it takes the LV stage out of your lamps. Sure, it's AC output, but you can do DC too - and active rectification will become cheap in a hurry if you want it to. I think we both know they'd end up needing to use bridge rectifiers to prevent wiring mistakes or unpolarised connectors being problematic anyway.
And of course, there are much better examples around which take discrete dimmer inputs and so forth.
vad:
--- Quote from: Monkeh on October 26, 2019, 10:25:12 pm ---
--- Quote from: vad on October 26, 2019, 10:24:05 pm ---Unfortunately, I still have to come across AC-powered A19 LED bulb that can work reliably in fully-enclosed or semi-enclosed luminaries (up to promised 25,000+ hours MTBF, without thermal intermittent shutdowns or bricking itself). And I still have to come across AC-powered A19 LED bulb that can dim properly.
--- End quote ---
I'll show you again for the hard of seeing:
It's tiny, it's SELV, it's efficient (okay I haven't measured it), it's cheap, it uses existing reasonably sized distribution, and it takes the LV stage out of your lamps. Sure, it's AC output, but you can do DC too - and active rectification will become cheap in a hurry if you want it to. I think we both know they'd end up needing to use bridge rectifiers to prevent wiring mistakes or unpolarised connectors being problematic anyway.
--- End quote ---
I, personally, have three problems with this particular device: (1) it is not UL-listed, (2) my nearest Home Depot does not stock 12VAC operated A19 LEDs, (3) I doubt it will work properly with Lurton Caseta dimmers.
wraper:
--- Quote from: vad on October 26, 2019, 10:33:04 pm ---I, personally, have three problems with this particular device: (1) it is not UL-listed, (2) my nearest Home Depot does not stock 12VAC operated A19 LEDs, (3) I doubt it will work properly with Lurton Caseta dimmers.
--- End quote ---
No shit Sherlock. It's rated for 230V AC therefore not for US market. And it's not a LED driver.
Monkeh:
--- Quote from: vad on October 26, 2019, 10:33:04 pm ---I, personally, have three problems with this particular device: (1) it is not UL-listed
--- End quote ---
It is quite amazing that products intended for sale in the UK and/or EU are not UL listed, yes. My point is the technology and products exist, and they've quite specifically not gone the route of relatively high current DC distribution around properties for the last 30 years for good reasons.
--- Quote ---(2) my nearest Home Depot does not stock 12VAC operated A19 LEDs
--- End quote ---
Of course they don't, if they did people would put them in 120V outlets and things would explode. It should be readily apparent that you will require an appropriately non-interchangable fitting for such radically different supplies, whether you go the route of distributing them unreasonable distances or use local regulation..
--- Quote ---(3) I doubt it will work properly with Lurton Caseta dimmers.
--- End quote ---
I'm not going to research how those operate to determine that. I rather doubt your proposal would either.
--- Quote from: wraper on October 26, 2019, 10:38:42 pm ---And it's not a LED driver.
--- End quote ---
Indeed, it's merely a stand-in for the basically identical constant-voltage DC, constant-current DC, and variable voltage or current dimming drivers, because I lack the patience to dug up specific examples of such for this guy.. Mind you, there's a multitude of 12V AC/DC operated LED lamps, dimmable and not, which are suitable for use with a supply such as this.
wraper:
--- Quote from: Monkeh on October 26, 2019, 10:40:38 pm ---Indeed, it's merely a stand-in for the basically identical constant-voltage DC, constant-current DC, and variable voltage or current dimming drivers, because I lack the patience to dug up specific examples of such for this guy.. Mind you, there's a multitude of 12V AC/DC operated LED lamps, dimmable and not, which are suitable for use with a supply such as this.
--- End quote ---
It's drop in SMPS replacement for (usually toroidal) halogen lamp transformers.
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