There are quite a few reasons. Dimming alone greatly reduces energy consumption
and may pay for itself through energy savings not to mention extending
bulb life 10 times or more.
Lighting systems that combine occupant sensing can also turn lights on as someone enters a room and then off
when they leave saving energy from leaving lights on when not needed.
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When 2 or more dimmers are in the same wall box, they are considered
"ganged". To install ganged dimmers, simply remove the dimmer side
sections from the heat sink. The maximum wattage capacity for each
dimmer is reduced (derated) so that the dimmer does not overheat.