A luminaire produces lighting as a series of frames of constant spectral content. The luminaire includes an interpreter for executing scripts that describe the spectral contents of respective frames. The scripts may include spectral data and executable code for altering the spectral data. In particular, a frame descriptor may include data for a frame, a repeat count indicating a number of frames, and an identifier for a subroutine to be called for each frame described by the frame descriptor. One or more luminaires can be network connected to one or more computers running applications providing user interfaces for script generation. A standardized interface can control communications with the luminaires and convert scripts from applications to a format that luminaires can interpret.