Light exposure tracking system, device, and methods

1. A system for monitoring ultraviolet (UV) exposure of a wearer, comprising:

a wearable device operable to sense UV radiation levels to which the wearer is exposed and to transmit UV radiation information;

a computing device in communication with said wearable device, wherein said computing device is operable to receive the UV radiation information from the wearable device, to correct for radiation noise in the UV radiation information, and to determine a real-time UV index value of the wearer based upon the UV radiation information,

wherein said wearable device or said computing device is further configured to generate, based on the real-time UV index value of the wearer, an alert to notify the wearer to apply or reapply sunscreen.

2. The system of claim 1 , wherein said wearable device comprises a band for securing said wearable device to a body part of the wearer.

3. The system of claim 1 , wherein said computing device comprises a smart watch.

4. The system of claim 1 , wherein said computing device comprises a memory configured to store the UV radiation information transmitted from said wearable device, and wherein said memory is further configured to store one or more wearer characteristics.

5. The system of claim 4 , wherein said one or more wearer characteristics includes the wearer's Fitzpatrick skin type and/or a sun protection factor (SPF) value for sunscreen applied by the wearer.

6. The system of claim 1 , wherein said computing device is further operable to determine a percentage of minimal erythema dose of the wearer based upon the UV radiation information.

7. The system of claim 6 , wherein the percentage of minimal erythema dose is based upon an Adjusted SPF value that is a percentage of the actual SPF value for the sunscreen applied by the wearer.

8. The system of claim 7 , wherein the Adjusted SPF value is about 25% of the actual SPF value for the sunscreen.

9. The system of claim 6 , wherein the percentage of minimal erythema dose is based upon an adjusted UV index value, which is based upon an orientation of the wearable device relative to the sun.

10. The system of claim 6 , wherein said wearable device or said computing device is operable to generate the alert to notify the wearer to apply or reapply sunscreen when the percentage of the wearer's minimal erythema dose reaches a threshold value.

11. The system of claim 1 , wherein the computing device comprises a processor configured to execute machine readable instructions that cause the processor to:

store, in a memory, the UV radiation information transmitted from the wearable device;

apply a device-specific calibration coefficient to the UV radiation information;

correct for visible and infrared radiation noise in the UV radiation information; and

average UVA and UVB levels in the UV radiation information to generate an output for the wearer's real-time UV index value.

12. The system of claim 1 , wherein the real-time UV index value is displayed for a user on the computing device.

13. The system of claim 1 , wherein said system is further configured to monitor vitamin D production of the wearer based on the UV radiation levels sensed by the wearable device.

14. A method of monitoring ultraviolet (“UV”) exposure of a wearer, comprising:

detecting UV radiation levels to which the wearer is exposed via a wearable device worn by the wearer, wherein the wearable device comprises a UV sensor configured to generate UV radiation information;

transmitting the UV radiation information to a computing device;

correcting the UV radiation information for radiation noise;

determining a real-time UV index value of the wearer based upon the UV radiation information; and

generating an alert, based on the real-time UV index value of the wearer, to notify the wearer to apply or reapply sunscreen.

15. The method of claim 14 , wherein the wearable device comprises a band configured to secure the wearable device to the wearer.

16. The method of claim 14 , wherein the computing device comprises a smart watch.

17. The method of claim 14 ,

wherein the computing device comprises a memory,

further comprising storing, in the memory, (i) the UV radiation information transmitted from the wearable device and (ii) one or more wearer characteristics, wherein the one or more wearer characteristics includes the wearer's Fitzpatrick skin type and/or a sun protection factor (SPF) value for sunscreen applied by the wearer.

18. The method of claim 17 , further comprising determining a percentage of minimal erythema dose of the wearer based upon the UV radiation information.

19. The method of claim 17 , wherein the percentage of minimal erythema dose is based upon an adjusted SPF value, which is a percentage of an actual SPF value for the sunscreen applied by the wearer.

20. The method of claim 17 , wherein the wearable device or the computing device is operable to generate the alert to notify the wearer to apply or reapply sunscreen when the percentage of the wearer's minimal erythema dose reaches a threshold value.

21. The method of claim 17 , further comprising:

applying a device-specific calibration coefficient to the UV radiation information;

correcting for visible and infrared radiation noise in the UV radiation information; and

averaging UVA and UVB levels in the UV radiation information to generate an output for the wearer's real-time UV index value.

22. The method of claim 14 , further including the step of monitoring vitamin D production of the wearer based on the UV radiation levels detected by the wearable device.