Light fidelity based indoor guidance system for the blind

Household leds are led bulbs that are used in houses. Basically bulbs with leds instead of tungsten.i decided to use these led bulbs because it's easy to switch them at a very fast rate.
I plan to use on off keying modulation. For every 1 the bulb shall be on, for every zero it shall be off, this will happen at a very fast rate, that the human eye won't be able to notice.