Investigation of the Use of Energy Efficient Bulbs in Residential Buildings in Ile-Ife, Osun State, NigeriaInvestigation of the Use of Energy Efficient Bulbs in Residential Buildings in Ile-Ife, Osun State, Nigeria. (2018). International Journal of Built Environment and Sustainability, 5(2). https://doi.org/10.11113/ijbes.v5.n2.269