Interpretation ID: nht76-2.42

DATE: 12/01/76 EST

FROM: AUTHOR UNAVAILABLE; E. T. Driver; NHTSA

TO: Koito Manufacturing Co., Ltd.

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your letter of November 2, 1976, regarding questions on Docket No. 75-8; Notice 5, for a two-lamp rectangular headlamp system. The answers are provided in accordance with the paragraph numbering of your letter.

1) The two-lamp rectangular headlamps must meet the requirements of SAE J579c.

This is an improved performance lamp over the requirements of SAE J579a and, therefore, must meet the requirements of SAE J579c.

2) The maximum permissible candela for the Type 2B headlamp is 75,000 as specified in SAE J579c. The lower limit for other types of headlamps is retained awaiting future rulemaking action.

3) SAE J580b as specified in the 1976 edition of the SAE Handbook is the correct reference specification for the Type 2B Sealed Beam Headlamp Assembly.

3-1) Answered above

3-2) Answered above

3-3) Appropriate revisions to subreferenced SAE standards have at this time not been made for the Type 2B headlamp. In the case of SAE J580b, conducting the tests with a modified deflectometer to fit the Type 2B lamp would be sufficient. It is anticipated that revisions will soon be made to the appropriate subreferenced SAE standards for the Type 2B headlamp.

Your suggested revisions for the referenced and subreferenced SAE standards to incorporate the Type 2B headlamp, including a modified design of deflectometer, may be sent directly to:

Society of Automotive Engineers Detroit Office, Suite 206 2100 West Big (Illegible Word) Troy, Michigan 43084 ATTENTION: Mr. James Tishkowski

We hope this clarifies the questions contained in your letter. If you have additional questions, please do not hesitate to contact us.