Optical Warning Devices for Authorized Emergency, Maintenance, and Service Vehicles
- Ground Vehicle Standard
- J845_200712
- Revised
Scope
Rationale
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1
Various editorial changes were made to harmonize the language with that used in other warning lights and devices standards.
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2
Multiple flash patterns and cyclic patterns have been added. End users have increasingly been requesting non-repetitive flash patterns to prevent complacency.
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3
Light Source definition has been added.
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4
Light pulse and flash definitions have been revised.
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5
Optical Power has been defined.
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6
Multiple flash patterns that are user adjustable must be rated as the lowest performance mode.
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7
Flash Rate was added to Section 5, “Tests”.
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8
Test Voltage – In conformance with other optical warning device reports, a tolerance has been added to the test voltages, and requirements added for 36 volt systems.
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9
Environmental tests for flash rate were revised.
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10
Photometric performance has been changed from flash energy to meeting a specified optical power and peak intensity. Advances in laboratory instrumentation have made it practical and cost effective to directly measure the optical power generated by any optical warning device. The direct measurement of peak intensity also is readily done with current technology.
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11
The redefinition of the white boundary toward blue was added in anticipation of a change to the SAE J578 specification to harmonize color boundaries with the ECE standard.
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12
New markings for selective coverage devices were added to provide a marking distinction between omnidirectional devices and devices with selective coverage.
Recommended Content
Topic
Data Sets - Support Documents
Issuing Committee
Emergency Warning Lights and Devices Standards Committee
The Emergency Warning Lights and Devices Standards Committee is part of the Lighting Systems Steering Committee that reports to the Motor Vehicle Council (MVC).The Committee is responsible for developing and maintaining SAE Standards, Recommended Practices, and Information Reports related to the minimum performance specifications and best practices of emergency warning lights and sirens for vehicles. Participants in the SAE Emergency Warning Lights and Devices Standards Committee include OEMs, test laboratories, consulting firms, government, and other interested parties.