Capture UV light during the day, release it at night as visible light. You gotta love things like this! See:
http://www.theatlanticcities.com/commute/2013/10/britain-experimenting-glowing-seemingly-self-aware-bike-path/7413/ - Jed
Capture UV light during the day, release it at night as visible light. You gotta love things like this! See:
http://www.theatlanticcities.com/commute/2013/10/britain-experimenting-glowing-seemingly-self-aware-bike-path/7413/ - Jed