Although you might be tempted to save some money and climb a ladder to change a bulb, it's better practice to bring in a contractor who will be able to do the job using the proper equipment and will be able to spot potential problems that an untrained person would probably not notice. Parking lot light installation does not need to be stressful, but it does take planning. Hire a professional to plan and implement your installation, and you can be confident that it will be done according to the required standards.