The highest operating cost for parking lots and garages is going to be lighting, making them a huge beneficiary when it comes to a lighting retrofit. Their maintenance costs are colossal as they are constantly replacing bulbs and ballasts. Most property owners understand that a well lit lot makes their customers feel safer and their cars less likely to get broken into. Also the more lights that are out in a lot, gives the customer the appearance of poor management.
lighting represents 40% of the average commercial building’s electric bill
http://www1.eere.energy.gov/buildings/tax_commercial.html
