Remove or reduce unnecessary lighting

Why

Lighting accounts for 1/5 of home electricity use.  If an area is overlit, that electricity is being wasted.  Don’t reduce light levels beyond what is comfortable.

How

If a fixture holds a few bulbs, maybe you can just remove one or two.  Otherwise, use lower wattage bulbs.  For example, replace a 23 W compact fluorescent with a 13 W.  Also, a cool white or daylight bulb appears brighter, so if you like the look of cool white or daylight for a given room, try one of those.