steps-

•       the lights will need to be installed by technicians and will a cherry picker because the lights are far from the ground  
•       with the lights installed which would take a full day you will see the difference  
•       then just check to make sure everything is in proper working order               
   

fluorescent bulbs in parking lot lights are the brightest and most efficient with low maintenance cost. these highly efficient bulbs will last for . 

For more information on different types of bulbs try this website. http://greenliving.nationalgeographic.com/energy-efficient-bulbs-halogen-vs-fluorescent-vs-incandescent-3228.html