To develop a universal location guidance system for the blind, we are studying an indoor location positioning method. For such purposes, several new information transmission methods using a fluorescent light were proposed by Steven Leeb et. al. However, in the case of digital data transmission using frequency modulation, there are difficulties for high-speed data transmission because of brightness fluctuation in fluorescent light. In this paper, using a guidance system developed by our group, we examined the position data transmitted at the speed of 4800 bps, and observed a fluctuating receiving signal in the speed of 9600 bps. Moreover, in case information is transmitted, we describe flickering generated from a fluorescent light.