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In the electrical schematic shown, a typical light dimmer based on a silicon-controlled rectifier (SCR) dims the light through phase-angle control. This unit is wired in series with the load. Diodes (D2, D3, D4 and D5) form a bridge, which generates pulsed DC. R1 and C1 form a circuit with a time constant.
The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED. The voltage drop across a lit LED is approximately constant over a wide range of operating current; therefore, a small increase in applied voltage greatly increases the current.
As a practical matter, many 0-10 V dimming control inputs can be operated by replacing the variable control resistor with an electronic switch. When the switch is on, the control voltage is near 0 and the light is fully dim. When the switch is off, the control voltage is maximum and the light is fully bright.
All lights on Switches on all lighting devices (with the ability to control brightness) X 0 1 1 0: All lights off Switches off all lighting devices X 0 0 1 0: On Switches on a device X 0 0 1 1: Off Switches off a device X 0 1 0 0: Dim Reduces the light intensity X 0 1 0 1: Bright Increases the light intensity X 0 1 1 1: Extended code Extension ...
A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...
Adjusting the brightness of light emitted by a light source is then merely a matter of setting at what voltage (or phase) in the AC half-cycle the dimmer begins to provide electric current to the light source (e.g. by using an electronic switch such as a triac). In this case the PWM duty cycle is the ratio of the conduction time to the duration ...
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An LED strip, tape, or ribbon light is a flexible circuit board populated by surface-mount light-emitting diodes (SMD LEDs) and other components that usually comes with an adhesive backing. Traditionally, strip lights had been used solely in accent lighting, backlighting, task lighting, and decorative lighting applications, such as cove lighting.