The Reverse phase dimmer is more suitable for dimming LED lights however it comes with a higher price tag. Both forward phase and reverse phase are capable of dimming LED lights as long as the LED driver within the bulb is compatible. PWM dimmers come in two forms: Forward Phase and Reverse Phase. The human eye cannot see this rapid on/off cycle of the LEDs, but rather perceives changes in light brightness levels.Ģ00Hz LED Duty-Cycle Pulse width modulation dimmers Likewise, if the dimmer is set to 20% the constant current pulse are ON for 1 millisecond and OFF for 4 milliseconds. This would be a duty cycle of 50% where the constant current pulse is ON for 2.5 milliseconds and OFF for 2.5 milliseconds. Dimming LED lights to 50% brightness correlates to setting the dimmer switch to the half way position. For example, if the output frequency of the PWM is 200 hertz, one cycle is equal to 1/200 = 5 milliseconds. The duty-cycle refers to the amount of time the constant current pulse is on over the duration of one cycle. This output signal is then applied to more electronic components that produce constant current pulses that are supplied to the LEDs within the bulb.Ĭonstant current pulses vary in duty-cycle depending on the output from the PWM controller. The PWM controller produces an output signal that can be manipulated, but is proportional to this input. This controller receives signals regarding the degree of voltage cut out, supplied from the dimmer switch. One of the components within the LED driver is the pulse width modulation controller. These electronic circuits are referred to as the LED driver. Each LED light bulb (or LED luminarie) has electronic circuits built within it. As mentioned previously, dimming LED lights is more complex. The direct correlation between the amount of power the light receives and the light brightness level does not apply when dimming LED lights. ![]() The light is at its dimmest level when the largest amount of voltage is cut out of the sinusoidal waveform. The light is at its brightest level when the least amount of voltage is cut out of the sinusoidal waveform. The amount of light output from conventional incandescent lighting is directly related to the amount of power supplied to the light. This reduces the root-mean-square voltage applied to the light and hence reduces the power supplied to the light. These dimmers use electronic components to cut out sections of the sinusoidal voltage waveform. ![]() The most common dimmer used for lighting is the Pulse Width Modulation (PWM) dimmer. Incandescent bulbs have approximately the following lumen output: Incandescent bulbs vary in brightness based on the power they consume. The equivalent wattage is a representation of the bulb brightness (lumen output) compared to that of an incandescent bulb. The wattage refers to the actual power consumption of the LED light without dimming the bulb. This can be confusing and it is due to a consumer learning curve of how we traditionally purchased light bulbs. Packaging for LED lights often includes labels with wattage and equivalent wattage ratings. LED lighting wattage and equivalent wattage ratings Replacing all your incandescent and halogen bulbs with equivalent LED bulbs will considerably reduce your energy consumption and energy bill. LED bulbs do not produce much heat and are therefore up to 90% more energy efficient. Incandescent and halogen bulbs waste a considerable amount of energy in the form of heat while producing light. When you use incandescent or halogen bulbs for lighting, the energy consumed by these lights adds up to in a significant portion of your home’s overall energy usage. ![]() Dimming LED lights properly mirrors the ambiance created from incandescent dimming and is much more energy efficient. Dimming LED lights is more complex which consequently creates issues if done incorrectly. Incandescent lights are simple and effective too dim however, they are not energy efficient. ![]() Low levels of light may be desirable to set the mood for movie nights, or to create a relaxing environment before going to bed. Dimming LED lights allows you to control light output levels to create an ambiance suitable for the occasion.
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