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Emergency True Sine Wave and LED

The decision to use a true sine wave is not a function of the light source, but the design of the driver or ballast.  Typically, a fixture with good power factor (greater than 80%) or universal input (120 thru 277, 50/60 hz) has input power conditioning that will operate with various AC waveforms.  However older fixtures with core & coil transformers should use true sine wave power.

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