Repair sticky windows which do not open

At night, turn on porch light and outdoor lighting

Clean all switchplates

Clean all windows, inside and out

Clean existing shutters, blinds or drapes

Clean skylight for leaves and other debris

Increase the wattage of bulbs to maximum possible wattage

Install dimming switches in common rooms such as dining rooms and living rooms to allow you to create lighting for different occasions

Install new window treatments if those you have are damaged or dated

Keep curtains open and use natural light as much as possible

Make sure all outdoor lighting works

Prune outside trees to allow natural light inside

Turn on enough lights so home is well lit during showing

Wipe all light fixtures with a rag and cleaning solution