A wearable sensor device, system, and methods for electronically monitoring safe ultraviolet and infrared radiations and beneficial visible light exposure based on sensor data and clinical information data relevant to estimate a personalized radiation pattern for disease prevention, a personalized radiation pattern for an evolution in disease activity or skin aging from radiation exposure of the user of the wearable sensor device and other users of the wearable sensor device. The wearable sensor device includes one or more UV sensors, an ambient light sensor, one IR sensor, and the wearable sensor device is in communication with remote computing devices to communicate sensor data and to calculate, send, and receive recommendations regarding beneficial radiation exposure and safe UV and IR exposure at the wearable sensor device, or remote computing devices paired with or connected to the wearable sensor device.