General > General Technical Chat
The EU is banning 8K TV's!!!
james_s:
--- Quote from: PlainName on November 04, 2022, 09:46:35 pm ---
--- Quote ---Burning coal to power an incandescent lamp releases more mercury into the environment than throwing away a CFL.
--- End quote ---
Are CFLs powered by some magic non-coal derived source, then? To put it another way, burning coal to power a CFL surely releases slightly less mercury from the power but an additional dump from the CFL at EOL (which, typically, would be sooner than the incandescent lamp).
--- End quote ---
No of course not, but they consume roughly 1/6 as much energy so you still come out ahead. As I've said earlier, I typically got much longer lifespan from my CFLs than from the incandescent lamps they replaced.
james_s:
--- Quote from: Bud on November 04, 2022, 10:03:25 pm ---Funny enough, I used a few spare CFLs in my fridge. They only lasted 2 weeks each. Surely there is plenty of cold air in the fridge, so they did not die because of overheating. I still do not know why they died that fast.
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Rapid cycling, and probably the low temperature too. Lower is not better, fluorescent lamps have a specific temperature range over which they are designed to operate which corresponds to the vapor pressure of the mercury inside them. Cold weather operation can be challenging, fluorescent tubes meant for cold weather ran at higher current and you could get special low temperature ballasts, mostly used in signs. Even then when it got *really* cold out, fluorescent signs would be very dim.
james_s:
--- Quote from: tom66 on November 04, 2022, 10:29:30 pm ---Unfortunately, a bit of both. We need to drastically cut CO2 emissions, but also work to mitigate the worst effects. That means building flood defences, security for energy grids against extreme temperatures (no Texas again, please), insulating existing homes, building *new* homes to be zero carbon, look at genome engineering or at least crop selection to be more rugged to extreme heat/longer droughts -- all of that stuff.
There's no scenario in which we don't reduce emissions and only mitigate the badness and survive the long term in any reasonable manner. It'd be a bit like the lung cancer patient smoking 40-a-day after their tumour was excised.
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Unfortunately I think that's totally impractical and wishful thinking. Even if you could build all new houses to be zero carbon and people could still afford them, there is still the inconvenient fact that a huge chunk of pollution comes from the third world and developing nations and they are many decades behind other regions. I was surprised to learn recently that as much kerosene is used for lighting still as is used in air transport. Kerosene lamps are still a daily use device in some parts of the world. There are vast areas that don't have electricity, let alone heat pumps.
timenutgoblin:
The real reason these TVs use so much power:
BrianHG:
--- Quote from: raptor1956 on November 04, 2022, 01:35:56 am ---An 8K TV/monitor will tend to consume more power at a given size and brightness as it will have 4X as many transistors switching as a 4K TV/monitor does. But, an 8K TV of, say, 25 inches diagonal will not likely consume as much power as a 4K TV that's 55 inches when operating at the same brightness.
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Dead wrong... The 4x transistor count to drive any LCD is the smallest amount of current used. Active matrix LCDs consume close to no current. LCD switching current is related to the total surface area of LCD fluid you are actively charging and discharging as the LCD fluid acts like a capacitor. So the screen resolution does not affect the current draw. Though, screen size and scan rate does.
All you had to do was watch my linked video here and you were told exactly why the 8k TV need so much more electrical power, 3x more power hungry placing it way above the European limit.
https://www.eevblog.com/forum/chat/the-eu-is-banning-8k-tvs!!!/msg4499227/#msg4499227
For those who don't believe me, seek to 4:10 in the attached video and the truth about the pixel aperture of the 4x higher density LDC which requires a back-light with 3x the brightness just to get a minimal acceptable brightness image completely blowing out the European power limit with no route to solving the problem with modern LCD technology.
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