Why Dimming?:

Dimming has these advantages:
Dimming saves power by giving the user convenient control over the level of lighting. The user is no longer confined to using the one level of power and now has a choice:

Light Level Electricity Saved Extends Bulb Life
90% 10% 2x
75% 20% 4x
50% 40% 20x
25% 60% > 20x