FLUX is an innovative solution for building envelopes that optimizes daylight and solar heat gain. It facilitates variable light transmission to achieve better luminous efficacy notwithstanding the varying angles of the sun. The strategically placed opaque angular louvers create diagonal light-ducts that control the amount and quality of diffused daylight. Other existing daylight panels have widely varying daylight transmissions from morning to evening, resulting in user discomfort and reduced energy efficiency. FLUX, with its myriad structure combinations, enables boundless creativity along with performance.