1. A method performed by a computer system for modeling light in a predetermined physical space, the method comprising: acquiring at least one first light reading at a first spatial location and at least one second light reading at a second spatial location; and building a model of the light distribution in the predetermined physical space based on the at least one first and second light readings, the step of building a model including determining a radiance of at least one third spatial location of the predetermined physical space using a triangulation of the at least one first and second light readings.