Specifications include, but are not limited to: 12 INCH (300 MM) LED CIRCULAR AND ARROW TRAFFIC SIGNAL LAMP UNIT This specification describes the minimum acceptable design and performance requirements for 12 inch (300 mm) light emitting diode (LED) circular and arrow traffic signal lamp units (hereafter referred to as modules) for span wire and mast arm applications. All modules shall conform to the latest versions of the Institute of Transportation Engineers (I.T.E.) Vehicle Traffic Control Signal Heads (VTCSHs) LED Vehicle Arrow Traffic Signal Supplement standard, the I.T.E VTCSHs LED Circular Signal Supplement standard, and this specification. In the case of conflicts between standards and specifications, the latest City of Wichita specifications shall govern. The module shall be designed as a retrofit replacement for optical components in existing signal housings which will not require any special tools for installation. The module shall fit into existing traffic signal housings without modifications. Installation of a module into existing signal housing shall only require removal of the existing lens, reflector, and incandescent lamp, fitting of the new module securely in the housing door with existing lens screws, and connecting to existing electrical wiring or terminal block by means of simple connectors. If proper orientation of the LED circular traffic signal lamp unit is required for optimum performance, prominent and permanent directional marking(s), that is an “UP arrow” or equivalent, for correct indexing and orientation shall exist on the unit.
