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He looks like a troublemaker.My little best mate
Should have called him snoop dogg, he is cannabis crazy. Wish he was this disciplined with bud and stems and not just his treats.
You've got to have eyes in the back of your head to watch this little speed demon.
Little but like lightning.
Although he's also doubled in size in 2 weeks. You could see his ribs when I got him. View attachment 1058884
I had never heard that...Also any ideas why the power consumption goes up when the domes are off the bulbs?
I had never heard that...
The only thing I could possibly think of is that they have some kind of gauge that modulates their output based on their temperature (sorry, I don't know what the technical terms for that would be by any means.. if there are such things.) But that sounds kind of farfetched...
I'll look into it a bit more while I'm bored at work tomorrow because now I'm intrigued. I'll fill you in with what, if anything, I find.
As we know LEDs are after all diodes which are by nature semi-conductors.
As we know with the increase in temperature the free ions in the semi conductor also increases.which again means higher the temperature(up to some limit) lower the resistance and higher the conductivity. ( meaning diodes have negative temperature coefficient of resistance).
Now coming to the actual answer
At low temperatures the free ions inside the LED is less ( meaning it has a higher resistance). Thus we have to provide a higher potential difference in order to obtain the same output. Hence the efficiency is low at lower temperature s.
Higher the resistance lower the current, lower the current lower the re-combination of electron-hole pairs.
Lower the re-combination lower the light emitted.
Which inturn means low light efficiency
So, I immediately went to satisfy my curiosity this morning about LEDs at lower temperatures.
So, from an Quora Q&A
Here's an article from the Lighting Research Center
Basically what I surmised was pretty much right...
So... taking the globe off, you're exposing the LEDs to a much bigger area, whereas they're used to having the globe as a sort of micro-envrionment that helps to more easily stabilize their temperature.
LEDs, because they're semiconductors, transmit their own energy more freely at higher temperatures. Less at lower.
Now, I thought, 'well, wait... wouldn't they simply just emit less light at lower temperatures because they're receiving the same current?"
Manufacturers put in a "compensation circuit" which adjusts for a constant light output in a given temperature.
Makes me wonder if those could be (or if they are..? not that I'm aware of) included in a high-powered grow light... might be pretty neat and maybe useful.
Now... where that video is misleading is that room temps aren't necessarily lower than the temps that would be in the globe.
Also, running LEDs at a higher temperature shortens their lifespan... so, what's really more efficient?
Oh, without a doubt. Cheaper materials and planned obsolescence is the name of the game these days.Thank you so much. This makes total sense.
I imagine the cheapo led makers are exploiting this somehow. better results and cost , traded off for less lifespan and extra power consumption to the consumer.