Why aren't many / most LED light bulbs dimmable?
On Sun, 26 Dec 2010 01:09:29 -0600, G. Morgan wrote:
wrote:
Resistors heat == inefficient
But the resistor will always be there. You are just making a bigger
resistor, the current will drop and the light will dim in a vary
linear way.
The voltage you drop across your resistor will be the same no matter
how big it is. That is not like a rheostat on an incandescent where
you are changing the voltage applied todrop the filament.
The voltage across the resistor *does* change. Also, P=I^2R.
How does the voltage change across a fixed circuit? I think
everyone here is talking about an Xmas tree lighting situation
(now), in a series arrangement.
He's talking about dimming LEDs, as in under-cabinet lighting.
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