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For shits & giggles, I decided to wire up a cob and see how it looked. Here's the backside of the cob while running at 0.2A (& 30.8V for ~6W) The LEDs shine thru the ceramic support.

What's going on with the specs for this cob? I can't find a clear reference to that particular chip. The specs only show the cxa3590 as having the Y (for 93+ cri), not the cxb3590?

Oh, whoops, he was asking about the -B. Ya it has external and no internal

Both -A and -AB have the Io adjustment, meaning there's a little dial onboard the drivers' circuit that you can adjust to control the maximum amount of current the driver will output. But this little dial can be fragile and it's not recommended you use it as the primary means of dimming your...

Finally got around to buying a Sensirion SDC40 CO2 sensor, grafted it to the esp8266 that monitors canopy temp & humidity (with a Sensirion SHT30), futzed around with calibrating it, and recorded a week's worth of data: I'm still having issues calibrating the PID controller that does heat...

Thanks for the vote of confidence but please don't bunch me in with the spectrum specialists. I gotta pick my battles and prefer to stick with knowing plenty about electrical circuits, automation, environmental control, programming, engineering, thermal dynamics, fluid mechanics, etc. :)

Wikipedia has a good entry on it, used to describe how creationists try to bury the conversation under a mountain of bullshit to the point where you just give up, and they claim victory

If it weren't for the gish gallops of bad faith arguments they wouldn't have anything at all.

Zero chemicals. Not even water, which is a chemical.

"Something never some before in this Country!). We did this once before to tremendous success" So which is it?

I bet the heat from the flaming dumpster fire of a process to replace him will be felt from the center of the sun.

I have those pants, a vest, and a cloak that I wear when it's time to get silly at the local fair. Adding gold sneakers will be the chefs kiss.

Needs to wear his gold sneakers

The orange one was on hannity recently talking about how he expected to get paid to return the docs, like Nixon did. As if the presidential records act wasn't a thing.

Maybe I'm slow but I don't understand what the NYpost article has to do with anything. Moving the goalposts?

Are you suggesting he should be? Cuz if biden should be, then definitely trump too, right?

Remember when Biden openly bragged about the secret documents he had and the material that was in them to his guests? Oh wait, no, that was the orange one at merdalardo.

Terpsareforme, do you have a voltmeter with which you could measure the voltage that's being output on one of your lights thats working? This would help narrow down the actual voltage your LEDs need.

Under most normal operations, the voltage an LED requires is determined by the current you're feeding it. Usually led vendors publish specs that list the max voltage required at the max amps that they recommend. In the case of the qb648, the (pretty crappy documentation relative to other specs...

I happen to be using an XLG-240-h-ab at the moment, it's really versatile when swapping lights to play around with various boards. It looks like two QB288 V2 rspec boards in parallel would settle right around 49.(something)V at 2.4A per board for 120W each. I run 10GA wire from my driver to the...