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This paper motivates the need for a new spectrum for current and future wireless networks. Furthermore, it argues that wireless networks based on light waves are at a very mature state. To this end, we introduce a taxonomy that defines the four major developments in this field: i) visible light communications (VLC), ii) optical camera communication (OCC), iii) free-space optical (FSO) communications, and iv) light-fidelity (LiFi) and discuss these technologies in the context of industrialdoi:10.1109/iswcs.2019.8877151 dblp:conf/iswcs/HaasC19 fatcat:k3hndomkizhnbl5e73jzp4lgdi