Sunday, October 14, 2012

LED Dimming

Although there is occasional compatibility between an LED lamp and an incandescent dimmer, more often than not there are problems with handshake and performance. The Incandescent dimmer will be inconsistent when dimming an LED. An incandescent lamp is simple in design and is ultimately a simple resistive load enclosed in a vacuum, this resistive load has a linear response to the dimmer as one adjusts the phase angle so the lamp burns more or less bright due to an altered wave form.
An LED lamp is far more complex in design with any number of technical and electronic differences between manufacturers, making it impossible to design a dimmer that can perform across the board.
LED technology is CONSTANT CURRENT technology, mess with the constant current and we have flickering or fluttering issues. This equates to a non linear relationship between the dimmer and Lamp.
Another factor creating confusion is that we may successfully dim one lamp whilst on the test bench and then have a totally different result when we connect to three, four or more lamps on the same bench.
My tip for the day , don't mess with Ohms law

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