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Video on planned obsolescence.

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Miyuki:

--- Quote from: wraper on April 04, 2021, 03:36:36 pm ---
--- Quote from: madires on April 04, 2021, 03:30:22 pm ---Have you noticed that after the Phoebus cartel was shut down standard incandescent bulbs are still rated for only 1000h? Business as usual - it doesn't need a cartel.

--- End quote ---
If you increase longevity, you will decrease lumens per consumed power, as I already mentioned. You will make more durable product but much worse overall.

--- End quote ---
There are, especially for cars headlight, light bulbs with like +25% or even +50% light output at the same power
But they pay for it with a very short life compared to standard ones

wraper:

--- Quote from: madires on April 04, 2021, 03:45:48 pm ---Like 42W halogen bulbs rated for 1500h (former replacement for standard 60W bulbs)?

--- End quote ---
It's a different technology. It's comparing apples with oranges. Even for halogen, there is no way around trading off between performance and durability. You just choose what you consider a sweet spot.

BrokenYugo:

--- Quote from: madires on April 04, 2021, 03:45:48 pm ---Like 42W halogen bulbs rated for 1500h (former replacement for standard 60W bulbs)?

--- End quote ---

Nature of the beast. The point of halogen is you can crank up the filament temperature (and thus efficiency) because magic chemistry inside the bulb puts the boiled off tungsten back on the filament, bringing the lifespan back to something tolerable.

SilverSolder:

--- Quote from: wraper on April 04, 2021, 03:36:36 pm ---
--- Quote from: madires on April 04, 2021, 03:30:22 pm ---Have you noticed that after the Phoebus cartel was shut down standard incandescent bulbs are still rated for only 1000h? Business as usual - it doesn't need a cartel.

--- End quote ---
If you increase longevity, you will decrease lumens per consumed power, as I already mentioned. You will make more durable product but much worse overall.

--- End quote ---

I don't understand the science behind that assertion - why would increased lifetime correlate with light output as a percentage of power consumed?

wraper:

--- Quote from: SilverSolder on April 04, 2021, 04:52:07 pm ---
--- Quote from: wraper on April 04, 2021, 03:36:36 pm ---
--- Quote from: madires on April 04, 2021, 03:30:22 pm ---Have you noticed that after the Phoebus cartel was shut down standard incandescent bulbs are still rated for only 1000h? Business as usual - it doesn't need a cartel.

--- End quote ---
If you increase longevity, you will decrease lumens per consumed power, as I already mentioned. You will make more durable product but much worse overall.

--- End quote ---

I don't understand the science behind that assertion - why would increased lifetime correlate with light output as a percentage of power consumed?

--- End quote ---

--- Quote from: wraper on April 04, 2021, 03:51:58 am ---As you decrease filament temperature to increase it's lifetime, bulb becomes less efficient as it's spectrum shifts more towards IR, thus more energy is spent on heating ambient rather than usable light. And light no longer will be "white" and will have a strong yellow/red tint.

--- End quote ---

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