NATURAL LIGHTING ANALYSIS OF DESIGN CHANGES BETWEEN DESIGN AND IMPLEMENTATION OF APARTMENT UNITS (CASE STUDY: APARTMENT UNIT TWIN KEY MAHATA MARGONDA)

As a tropical country, the sun line passes through Indonesia, and the abundance of sunshine that shines throughout the year provides abundant natural light. This sufficient natural lighting will save energy due to the minimal use of artificial lighting. This research attempts to find the natural lighting effect because room modification in apartment unit design on the Pondok Cina Transit-Oriented Development qualifies optimization of natural lighting. The specific objectives of this research are to evaluate methods and results analysis of natural lighting to make recommendations for building managers. Data processing is carried out with DIALux Evo 10 software simulations. First, a simulation is carried out, which obtains light intensity data. Then a comparison is made with SNI 03-2396-2001. If it meets, it can proceed to analyze data using Microsoft Excel. If it is not, it will be optimized with re-simulation until it meets SNI 03-2396-2001. The results of the simulation carried out on the DIALux Evo 10 application with the location of the Mahata Margonda Tower 2 Apartment on the 7th, 17th, and 28th floors at 08.00 am, 12.00 pm, and 04.00 pm. With the north solstice on June 21, 2022, the equator on September 23, 2022, and the south on December 22, 2022, after the simulation, test results on the modified unit meet the SNI of 13% and 15% for unmodified units. The comparison results showed that the unmodified unit is better than the modified one. Obtained efficiency after the design recommendations is pretty significant, reaching 76%. The furniture arrangement, blinds, opening material, and room openings affected the lighting level of the apartment unit. In this case, add a bouven at the top of the bathroom door and use a door with ice glass to connect the terrace.