Interpretation ID: nht92-8.47

DATE: February 21, 1992

FROM: Masashi Maekawa -- Director, Technical Division, Ichikoh Industries, Ltd.

TO: Paul Jackson Rice -- Chief Counsel, NHTSA

TITLE: Re: Request for the interpretation of photometric output requirements for tail/stop lamps on passenger cars

ATTACHMT: Attached to letter dated 4/10/92 from Paul Jackson Rice to Masashi Maekawa (A39; Std. 108)

TEXT:

Thank you for your answering letter dated Dec. 18, 1991 to our questions concerning the interpretation of photometer output requirements for tail/stop lamps on passenger cars dated Nov. 27, 1991.

We had some questions as follows regarding positions stated in the letter from NHTSA.

1. NHTSA stated in the letter dated Dec. 18, 1991 as follows;

" It is not possible to consider the two adjacent lamps as one lamp for purpose of measuring the minimum photometrics required under standard No. 108."

But another letter from NHTSA dated June 28, 1985 addressed to Mazda (North America), Inc. stated as follows;

" We also discuss the implications of a stop lamp and tail lamp constructed so that a portion is fixed to the body of the vehicle adjacent to the decklid opening and the remaining portion is mounted on the outboard area of the decklid.

Compliance of a vehicle is determined with respect to its normal driving position, that is to say, with the tailgate, hatch, or decklid closed."

We realized the noticeable difference between those two letters. We have been designing and testing lamps until now according to the interpretation dated June 28, 1985.

2. As the interpretation of the testing method concerning photometer output requirements of lamps mounted onto both the moving vehicle part and the rigid vehicle part is not written in FMVSS No. 108, we have been designing those lamps to comply with photometer output requirements by using both lamps mounted onto the moving vehicle part (Lamp-B) and the rigid vehicle part (Lamp-A), in accordance with the sentence "The device shall be mounted in its normal operating position." of J (Photometry) of SAE J575e incorporated in FMVSS No. 108.

For the reason mentioned above, we would like to ask whether your stance concerning the interpretation of those lamps has been changed or not.

Kindly let us know your opinion concerning the above matters.