Designers’ hands-on experience in research through design process contributes them to produce
 and share knowledge from their own design practices. In this study, the primary purpose was exploring
 sustainable design concepts and developing solutions for improving the product lifespan of household light
 with research through design process. With a particular focus on “emotionally durable design”, “product
 personalisation”, and “localisation” were considered fruitful concepts. The do-it-yourself (DIY) approach,
 which means that users participate in production, and the halfway product rationale, which leaves space for
 users to complete the production, were the concepts used in personalisation. The outcome of the research
 through design process was a wall lamp manufactured with different scales of production, involving
 personalisation features facilitated by DIY and halfway product rationale. For “localisation”, different scales of
 production opportunities were explored, and a design kit as a halfway product was considered as a sustainable
 design solution. DIY approach was benefited for producing complementary lace lampshade. In the design
 for sustainability framework, it is seen that experimenting and engaging with locally available materials and
 manufacturing capabilities in the research through design process nurtured developing sustainable design
 solutions.