Before installing external lighting, it is important to consider:
Is the lighting really necessary?
Will the lighting affect other people? - consider the direction of the beam and prevent ‘light spillage’ onto neighbouring properties
Do the lights need to be on all the time?
Could security be achieved in another way?
Where sensors are used to trigger lights, can these be set to avoid accidental triggering?
Is the proposed lighting too powerful for its intended use?
Is the light directed downwards?
Energy savings can be made by installing lower wattage bulbs and restricting times when lights are switched on.
You may have very good reasons for wanting to install exterior lighting but always consider the effect it will have on other people and take steps to prevent it becoming a nuisance. It is normally possible to set up lights without upsetting other people.