Efficient lighting emerges as a key player in enhancing household welfare, ensuring grid stability, curbing emissions, and prudent resource management. Yet, the adoption of energy-efficient lighting faces various drivers and barriers in this context. This study relies on household surveys conducted in Kibera and reveals that factors like knowledge, beliefs, and product durability significantly influence the use and willingness to pay for compact fluorescent lamp (CFL) bulbs. Notably, fixed monthly electricity rates in these settlements challenge the traditional cost-saving argument of energy efficiency, emphasizing the need for tailored messages considering contextual benefits and costs. Furthermore, the study highlights the importance of quality assurance to instill consumer confidence and recommends multifaceted strategies to promote energy-efficient lighting, aligning with the contextual conditions of informal settlements.