This SAE Standard provides test procedures, requirements and guidelines for red and yellow school bus warning lamps.

Rationale:
RATIONALE A Rationale is required explaining why the document is being revised. Manufacturers are now integrating flashers into the lamp, environmental tests for flash rate have been added Add reference to FMVSS108, CMVSS108, J387 terminology, J1330 laboratory accuracy guidelines Add color requirement – J578. This needs to be added to ensure consistency to other SAE lighting Add definitions: Light source, Light Pulse, and flash Update Photometric figures to allow more accurate interpretation Remove ASTM publication contact information Various editorial changes were made to harmonize the language used in other Warning Lamp and Devices Recommended Practices. Specify at which point the voltage from the power source is to be measured as a distance from where the wire exits device being tested to provide consistency in test setup Remove test equipment quidelines – these are specified in J1330 Change photometer sensor distance from 3m to 18m minimum distance from device – Harmonize with other warning lighting devices Update Alternate photometric test method to specifically require the lamp tested is Gaseous Discharge to prevent mis-understanding and testing other technology devices to this method Remove reference to instantaneous intensity must exceed 60% of values given for alternate method for a minimum of 50mS. Practice has been updated to specify the alternate method may only be used for gaseous discharge devices. Add J2139 for environmental testing for vehicles wider than 2032mm. The typical application for these devices is for school buses which are over 2032mm in width

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