TECHNICAL ISSUES Many technical issues have been overcome since the initial implementation of LED traffic signals. ... The monitoring logic is designed around the field indication circuit and electrical characteristics of a simple incandescent lamp. ... The MMU or CM specifies operation down to 60 Ap 10 volts, while LEDs are only required to operate at 80 volts. ... the load could be as little as 5 W. This has lead to the practice by some of installing a load resistor in the output circuit, anbsp;...
|Title||:||LED Traffic Signal Monitoring, Maintenance, and Replacement Issues|
|Publisher||:||Transportation Research Board - 2008-01-01|