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| LED lighting and planned obsolescence, intentional or not. |
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| NiHaoMike:
Wouldn't the easy way be to just buy dimmable LEDs which are much brighter than you need and just don't use them at full power? |
| gnuarm:
--- Quote from: NiHaoMike on August 08, 2023, 05:00:36 am ---Wouldn't the easy way be to just buy dimmable LEDs which are much brighter than you need and just don't use them at full power? --- End quote --- 1) There's no such thing as dimmable LEDs, just like CFLs. The controllers chop the AC waveform which doesn't work very well with these devices, even when they claim to be compatible, even when you combine specific model numbers that are claimed to be compatible. 2) LED brightness is controlled by current, not voltage. There's simply no practical way to make this work well, that doesn't burn excess power. |
| AVGresponding:
--- Quote from: gnuarm on August 08, 2023, 05:18:28 am --- --- Quote from: NiHaoMike on August 08, 2023, 05:00:36 am ---Wouldn't the easy way be to just buy dimmable LEDs which are much brighter than you need and just don't use them at full power? --- End quote --- 1) There's no such thing as dimmable LEDs, just like CFLs. The controllers chop the AC waveform which doesn't work very well with these devices, even when they claim to be compatible, even when you combine specific model numbers that are claimed to be compatible. 2) LED brightness is controlled by current, not voltage. There's simply no practical way to make this work well, that doesn't burn excess power. --- End quote --- Actually it's a long established method to control LED "brightness"; effectively a PWM controller, and LEDs are always rated by both continuous and pulsed current. |
| gnuarm:
--- Quote from: AVGresponding on August 08, 2023, 05:21:50 am --- --- Quote from: gnuarm on August 08, 2023, 05:18:28 am --- --- Quote from: NiHaoMike on August 08, 2023, 05:00:36 am ---Wouldn't the easy way be to just buy dimmable LEDs which are much brighter than you need and just don't use them at full power? --- End quote --- 1) There's no such thing as dimmable LEDs, just like CFLs. The controllers chop the AC waveform which doesn't work very well with these devices, even when they claim to be compatible, even when you combine specific model numbers that are claimed to be compatible. 2) LED brightness is controlled by current, not voltage. There's simply no practical way to make this work well, that doesn't burn excess power. --- End quote --- Actually it's a long established method to control LED "brightness"; effectively a PWM controller, and LEDs are always rated by both continuous and pulsed current. --- End quote --- How do you manage that from the wall control? |
| Marco:
--- Quote from: gnuarm on August 08, 2023, 05:18:28 am ---1) There's no such thing as dimmable LEDs, just like CFLs. The controllers chop the AC waveform which doesn't work very well with these devices, even when they claim to be compatible, even when you combine specific model numbers that are claimed to be compatible. --- End quote --- You can always buck boost. Also you can just say the lamp only works with trailing edge dimmers with adjustment pot and turn off at 90 degrees and let the customer figure it out. Full voltage always available after the rectifier, problem solved. |
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