1499 East Michigan Avenue, Battle Creek, Michigan  49014 

  PHONE:  (269) 964-7511  FAX:  (269) 964-7017

LED Internally-Illuminated Street Name Sign

Specification

1.0       General

1.1       An LED internally-illuminated street name sign shall display the designated street name clearly and legibly in the daylight hours without being energized and at night when energized.  The sign assembly shall consist of a four-, six- or eight-foot aluminum housing.  White translucent sign faces with the street name applied shall be installed in hinged doors on the sides of the sign for easy access to perform general cleaning and maintenance operations.  Illumination shall occur with a GELcore LED Light Engine per the attached specification.

2.0       Mechanical Construction

2.1       The sign shall be constructed using a weatherproof, aluminum housing consisting of an extruded aluminum top with a minimum thickness of .140” x 10 ¾” deep (including the drip edge).  The extruded aluminum bottom is .094” thick x 5 7/8” deep.  The ends of the housing shall be cast aluminum with a minimum thickness of .250”.  All corners are continuous TIG (Tungsten Inert Gas) welded to provide a weatherproof seal around the entire housing.

2.2       The door shall be constructed of extruded aluminum.  Two corners are continuous TIG welded with the other two screwed together to make one side of the door removable for installation of the sign face.  The door is fastened to the housing on the bottom by a full length, .040” x 1 1/8” open stainless steel hinge.  The door shall be held secure onto a 3/4” wide by 5/32” thick neoprene gasket by two or three (four or six total for two-way sign) quarter-turn fasteners to form a watertight seal between the door and the housing.

2.3       The sign face shall be constructed of .125” white translucent polycarbonate.  The letters shall be 8” upper case and 6” lower case (custom sizes available).  The sign face standard legend background shall be translucent green, #PT472, or equivalent, electronically cutable film, applied to the front of the sign face.  The legend shall be framed by a white polycarbonate border.

2.4       All surfaces of the sign shall be etched and primed in accordance to industry standards before receiving appropriate color coats of industrial enamel.

2.5       All fasteners and hardware shall be corrosion resistant stainless steel.  No tools are required for routine maintenance.

3.0       Electrical

3.1       LED Light Engine is manufactured per the attached GELcore specifications.

3.2       All wiring shall be secured by insulated wire compression nuts.

3.3       A wire entrance junction box shall be supplied with the sign assembly.  The box may be supplied mounted to the exterior or interior of the sign and provide a weather tight seal.

4.0       Brackets and Mounting

4.1       An LED internally-illuminated street name sign may be attached to a mast arm and/or span wires.  If the sign is attached to a mast arm or span wire that is perpendicular to the street that the sign faces, a two-point support assembly shall be used.  If the LED internally-illuminated street name sign is attached to a mast arm or span wire that is diagonal to the street that the sign faces then a single point support assembly shall be used.

General Purchase Specification

LED Light Engine for Illuminated Street Signs

1.0 PURPOSE

The purpose of this specification is to provide the minimum performance requirements for the LED Light Engine for illuminated street signs.  This specification is not intended to impose restrictions upon specific designs and materials that conform to the purpose and intent of this specification.  The LEDs utilized in this product shall be white in color and utilize InGaN or UV thermally efficient technology.

2.0 PHYSICAL AND MECHANICAL REQUIREMENTS

2.1 General

The LED Light Engines shall be designed to fit inside a standard fluorescent illuminated street sign in lieu of fluorescent lamps and ballasts. 

2.2 Environmental Requirements

The LED lamp shall be rated for use in the ambient operating temperature range of   -40 to +50°C (-40 to +122°F) and for storage in the ambient temperature range of -40 to +75°C (-40 to +167°F).

2.3 Construction

2.3.1 The LED Light Engine shall be a single, self-contained device, for installation in an existing street sign housing.  The power supply must be designed to fit and mounted on the inside wall at one end of the street sign housing.  The LED Light Engine shall be mounted within the inner top portion of the housing and no components of the light source shall sit between the sign faces.

2.3.2 The assembly and manufacturing processes of the LED Light Engine shall be designed to ensure that all LED and electronic components are adequately supported to withstand mechanical shocks and vibrations in compliance with the specifications of the ANSI, C136.31-2001 standards.  

3.0 ELECTRICAL

3.1 Voltage Range

3.1.1 The LED Light Engine shall operate from a 60 + 3 cycle AC line power over a voltage range of 80 to 135 Vac rms.

3.1.2 Fluctuations in line voltage over the range of 80 to 135 Vac shall not affect luminous intensity by more than + 10 %.

3.2 Power Factor (PF) and AC Harmonics

3.2.1 The LED Light Engine shall provide a power factor of 0.90, or greater, when operated at nominal operating voltage and at a temperature of +25°C (+77°F).

3.2.2 Total harmonic distortion induced into the AC power line by the LED Light Engine, operated at a nominal operating voltage, and at a temperature of +25°C (+77°F), shall not exceed 20 %.

3.3 Wattage

3.3.1 The LED Light Engine shall not exceed the following maximum power values:

3.4  Duty Cycle

The LED Light Engine shall be cycled ON and OFF with a photocell, timer, or other device that would only turn the unit ON during the hours of darkness.

4.0 PHOTOMETRIC REQUIREMENTS

4.1 Luminous Intensity & Distribution

4.1.1 The entire surface of the sign panel shall be evenly illuminated.  The average maintained luminous intensity measured across the letters, operating under the conditions defined in Sections 2.2 and 3.4, shall be of a minimum value of 100 cd/m².

4.1.2 The manufacturer shall make available independent laboratory test results to verify compliance to sections 3.3.1 and 4.1.1.  

5.0 QUALITY ASSURANCE

5.1 General

5.1.1 Quality Assurance Program

The LED Light Engine shall be manufactured in accordance with a vendor quality assurance (QA) program.  The production QA shall include statistically controlled routine tests to ensure minimum performance levels of the LED Light Engine build to meet this specification.

5.1.2 Record Keeping

QA process and test result documentations shall be kept on file for a minimum period of seven (7) years.

5.1.3 Conformance

The LED Light Engine that does not satisfy the production QA testing performance requirements shall not be labeled, advertised, or sold as conforming to these specifications.

5.2 Manufacturers Serial Numbers

Each LED Light Engine shall be identified by a manufacturer's serial number for warranty purposes. 

6.0 WARRANTY

6.1.1 LED Light Engines shall be replaced or repaired if they fail to function as intended due to workmanship or material defects within the first sixty (60) months from the date of delivery.

6.1.1 LED Light Engines that exhibit luminous intensities less than the minimum value specified in Section 4.1.1 within the first thirty-six (36) months from the date of delivery shall be replaced or repaired.