B.Ajithkumar, V.Bharathi, K.Kalaiselvam, S.Lalithaambika and G.Pradeepkumar (2018) “Design and development of visible light spotlighting system for location identification ”, International journal of intellectual advancements and research in engineering computations, 6(1), pp. 56–61. doi: 10.61096/ijiarec.v6.iss1.2018.56-61.