2010 Construction and Material Specifications - Ohio Department of ...

803
732.04
q. The module shall be designed to detect catastrophic loss of the LED load.
Upon sensing the loss of the LED load, the module shall present a resistance of at
least 250K Ohms across the input power leads within 300 msec.
r. Turn-On and Turn-off time is less than 75 msec. Also, low voltage Turn-
Off is less than 35 Volts.
2. Photometric Requirements
a. The red, yellow and orange lamps shall be manufactured using AlInGaP
(Aluminum-Indium-Gallium-Phosphide) technology or other LEDs with lower
susceptibility to temperature degradation than AlGaS (Aluminum-Gallium-
Arsenic). AlGaS LEDs will not be permitted. Green lamps shall be manufactured
using Indium Gallium Nitride.
b. Each LED traffic signal lamp unit shall meet minimum laboratory light
intensity values, color (chromaticity), and light output distribution as described in
ITE VTCSH – LED Circular Signal Supplement of the specifications 4.1, and 4.2
as a minimum. Table A-1 provides the minimum maintained luminous intensity
values for the VTCSH LED Circular Signal. Environmental test shall include an
expanded view for the red and green ball indications with the following minimums
for a period of 60 months.