Many businesses still have the old incandescent exit sign lights.  These are high maintenance and energy inefficient fixtures.   The fixtures typically use 2  20 watt incandescent screwin light bulbs (rated life is only 2000 hours).  These fixtures can be replaced with a new LED exit sign which uses only abou 2-4 watts depending on brand.  The LED lights typically are going to last at least 20,000 hours.  

The energy savings per year with the new LED light fixture is approximately $20 per year.