A modular light assembly is designed for integration with wearable devices. For example, the modular light assembly can connect with a wearable device, such as a smartwatch, including both a device housing and a band of the wearable device. Additionally, the modular light assembly can receive communication from the wearable device through various means, including inductive energy transfer. As a result, the modular light assembly can receive communication from the wearable device to activate (turn on) or deactivate (turn off) one or more light sources of the modular light assembly. Additionally, or alternatively, the modular light assembly device may include a button coupled to a switch that can activate or deactivate the light source(s).