Lighting the building with natural lighting is the best key for sustainable building designs. The daylight factor reading in building that exceeds the recommendedpercents resulting in glare causes negative effects on health of occupants, user satisfaction of space, and results on lack of output efficiency by the user. Hotel Penaga is an adaptive reuse hotel in Georgetown, Penang Malaysia and was awarded with Gold Rating from Malaysia Green Rating Tool, Green Building Index. A software was used to obtain the data of daylight factor at Penaga Hotel, Penang using Autodesk Ecotect Analysis to gain the simulation of Daylight Factor.