Professional LED Traffic Light Manufacturer & Exporter

Chevy Light have completely quality and environment system and passed the ISO9001-2000certifications.
The processes are monitored by many kinds of precise instruments and parameters

2.1 Catastrophic Failure. The total loss of visible illumination from an LED light source.
2.2 Chromaticity. The color of the light emitted by the module, specified as x, y chromaticity coordinates on the chromaticity diagram according to the 1931 Commission Internationale d’Eclairage (CIE) coordinate system.
2.3 Conditioning. Energizing an LED signal module at a specified ambient temperature for a specified period of time, to cause any early electronic component mortality failures to occur and to detect any component reliability problems.
2.4 Countdown Pedestrian Signal. A two-digit numeric interval countdown display used to inform the pedestrians of the number of seconds remaining in the pedestrian change interval.
2.5 Duty Cycle. The fraction of time during a specified time period that the module is energized, expressed as a percentage of the specified time period.
2.6 Hard Coat. A surface coating or a film used to provide front surface abrasion resistance.
2.7 Illuminance. The density of the luminous flux incident on a surface. Its value is determined by luminous intensity, angle of incidence and distance from the source to the surface, expressed as lux.
2.8 LED Light Source. A single light emitting diode (LED) or an array of LEDs.

2.9 LED Pedestrian Signal Module (module). A signaling unit comprised of an array of LEDs and related power supply and any required lenses, which, when connected to appropriate power, provides a pedestrian signal indication consisting of a “walking person” or “upraised hand” icon or both.
2.10 Luminance. The luminous flux emitted or reflected from a surface, in a given direction, per unit solid angle, divided by the area of the surface, expressed as cd/m2.
2.11 Luminous Intensity. The luminous flux emitted in a given direction from a source, per unit solid angle, expressed in candelas (cd).
2.12 Minimum Maintained Luminance. The minimum luminance a module is required to provide throughout service as a pedestrian indication or countdown display.
2.13 Nominal Operating Voltage. The AC RMS voltage, 120 VAC, at which photometric performance and power consumption are specified.  
2.14 Pedestrian Change Interval. Period of time when “upraised hand” icon is flashing to advise the Pedestrians that they should leave and /or not enter the intersection.
2.15 Power Consumption. The electrical power in Watts consumed by the module when operated at nominal operating voltage and ambient operating temperature range.
2.16 Power Factor (PF). PF equals Watts divided by Volt-Ampere (VA) or the ratio of power consumption in Watts to Volt-Amperes.
2.17 Total Harmonic Distortion (THD). THD is the ratio of the root-mean-square (RMS) value of the harmonics to the amplitude of the fundamental component of the AC waveform.
2.18 Translate. To move an object along a linear vector, such that the orientation of the object does not rotate relative to the original frame of reference.
2.19 Turn OFF Time. The amount of time required after removal of the nominal operating voltage for the LED signal module to show no visible illumination.
2.20 Turn OFF Voltage. The voltage below which the LED signal module emits no visible illumination.
2.21 Turn ON Time. The amount of time required for the LED signal module to reach 90 percent of full illumination.
2.22 Volt-Amperes. The product of root-mean-square (RMS) line voltage and RMS line current measured with true RMS meter.

Design Qualification Testing Flow Chart:

Design Qualification Testing Flow Chart:

Design Qualification Testing Flow Chart:

Design Qualification Testing Flow Chart