Getting used to photometric lights can take a little while, and the small number of creation options may seem limiting at first. However, their real-world parameters can make the application of these kinds of lights a better choice for more realistic or precise lighting simulations.
Open the file SAMS_Hour10_StreetLighting.max and light the scene using only photometric lights. Try creating a day scene and a night scene, which both have different challenges. This will give you a greater understanding of how lighting can dramatically affect the mood of a scene.