The incorporation of split louvers into building systems provides substantial potential for enhancing daylighting performance and

consequently

reducing lighting energy consumption. This study focuses on the critical aspect of determining the optimal positioning of split louver sections to ensure well-distributed daylight in indoor spaces and adding parametric control as a daylight redirection system. This research aims to investigate indoor daylight environments by modifying the relationships and configurations of split louver sections and enhancing the efficiency of daylighting performance through the parametric control of the split louver. In addition

it investigates the energy-saving potentials of using the parametric split louver through the reduction of electric lighting consumption. The study demonstrates that the daylighting performance of the split louver depends upon the status of each section. Specifically

the effects of the upper section of the split louver are predominantly apparent in the rear area of the room

whereas the lower section markedly enhances illumination in the frontal area near windows

particularly during winter months when the lower solar angles. Secondly

the daylighting efficiency of the parametric split louver outperforms that of the conventional single louver in terms of daylight distribution and availability. The efficient daylight performance is evident in the uniform distribution of illuminance within the useful daylight illuminance (UDI) range of 300–500 lux on all typical dates

reaching 44 % and 55 % during the morning and noon

respectively

on March 21st Additionally

the electric lighting efficiency of the parametric split louver surpasses conventional louver throughout the day for all typical dates

resulting in notable lighting energy savings

with average percentages 69.9 % and 63.5 % on March 21st and December 21st

respectively

while June 21st shows lower efficiency with 43.63 % savings. This study contributes valuable insights for architects and designers seeking to create energy-efficient and well-illuminated indoor environments through the integration of parametric split louver.