This paper presents a proposal for a cellular brise-soleil system appropriate for tropical humid climates. The system controls thermal gains whilst allowing for specific lighting requirements, permitting, in many cases, interior thermal and light comfort conditions without the use of thermal machines or artificial lighting. The development of the system involved a definition of variable design parameters and areas of performance evaluation and optimization, plus construction detailing development represented by a first project to be completed in 2014. Even if the geometrical definitions, optimization processes and production machinery are relatively simple and not particularly new to anyone in the field, it is claimed that the use of such already widely available technologies at this basic level, when solving relevant problems, has still to be used in generalised ways by common designers, and with the example shown, this paper wishes to promote such prospect.