Froggie: I had the same question. I was told there were lots of potential issues including the wiring itself (i.e. cable types), bulb contacts in older fixtures and the and “quality” of power (i.e. is your home on a feeder subject to voltage frequency fluctuations). The latter may not be a problem with older incandescent lights but is a big issue for LEDs. Circuits wired for dimmers may have frequency issues that are incompatible with the transformer used in higher lumen LED bulbs and can limit the full range of light or result in a “lag” after you turn the switch on/off.
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