Interpretation ID: 1985-01.40

TYPE: INTERPRETATION-NHTSA

DATE: 03/01/85

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: T. Chikada, Manager, Automotive Lighting, Engineering Control Dept., Stanley Electric Co., Ltd.

TITLE: FMVSS INTERPRETATION

TEXT:

Mr. T. Chikada, Manager Automotive Lighting Engineering Control Dept. Stanley Electric Co., Ltd. 2-9-13, Nakameguro, Meguro-ku Tokyo 153, Japan

This is in reply to your letter of January 11, 1985, to Mr. Vinson of this office, asking for a clarification of certain terminology relating to the definition of a standardized replaceable light source in Motor Vehicle Safety Standard No. 108.

We are aware of the problem underlying your question, i.e., that the standard contemplates testing of the bulb with its base but the photometrics specified are appropriate for the capsule portion alone. Our Rulemaking staff is reviewing this issue. The agency will inform you of the results of that review. If appropriate, the issue will be addressed through an appropriate interpretation or amendment of the standard.

Sincerely,

Frank Berndt Chief Counsel

January 11, 1985

Attn: Mr. Taylor Vinson Lawyer

Department of Transportation National Highway Traffic Safety Administration 400 Seventh Street, S.W. Washington, D.C. 20590 U. S. A.

Dear Mr. Vinson,

We are a little bit confused with your wordings in a current FMVSS 108 particularly on S3 "Definition" of specifying "Standardized Replaceable Light Source".

By the S3, Definition of Standardized Replaceable Light Source, it specifies that it is an assembly of a headlamp bulb, base and terminals as described in Fig. 3.

From the above S3 Definition, it can also be interpreted that the means a halogen capsule alone without base as described in Fig. 3 -5.

The lumen values specified in a (b) (1), the general specification of the bulb shall be: for standardized replaceable light source required in S4.1.1.38 of FMVSS 108, can we take that values measured from a halogen capsule alone, without base? Because the wordings are very ambiguous. Please refer the wordings and words underline in the attached.

What is more, at the (b) in S4.1.1.38 says, the bulb portion of the standardized replaceable light source, this bulb portion and the bulb in the (b) (1), the general specification of the bulb shall be: you are talking the same thing, Bulb only (means capsule) without base, we presume.

We would appreciate it very much if you would clarify the each meaning of the word, "Bulb" colored in blue and assembly, light source and the relation between the above words and standardized replaceable light source in the attached.

Sincerely,

Stanley Electric Co., Ltd.

T. Chikada, Manager Automotive Lighting Engineering Control Dept.

Encl. Copies of FMVSS 108 (5) KW/es

Federal Motor Vehicle Safety Standard No.108

Lamps, reflective devices, and associated equipment

S1. Purpose and scope

This standard specifies requirements for original and replacement lamps, reflective devices, and associated equipment necessary for signaling and for the safe operation of motor vehicles during darkness and other conditions of reduced visibility.

S2. Application

This standard applies to passenger cars, multipurpose passenger vehicles, trucks, buses, trailers (except pole trailers and trailer converter dollies), and motorcycles, and to lamps, reflective devices, and associated equipment for replacement of like equipment on vehicles to which this standard applies.

S3. Definitions

"Headlamp test fixture" means a device designed to support a replaceable bulb headlamp in the test position specified in the laboratory tests in S4.1.1.36(d), and whose mounting hardware and components are those necessary to operate the headlamp as installed in a motor vehicle.

"Replaceable bulb headlamp" means a headlamp comprising a bonded lens and reflector assembly, and a standardized replaceable light source.

"Seasoning" means a process of energizing the filament of a headlamp, at design voltage, for a period of time equal to 1 percent of average rated laboratory life.

"Standardized replaceable light source" means an assembly of a headlamp bulb, base, and terminals, as described in Figure 3.

S4. Requirements S4.1 Required motor vehicle lighting equipment

S4.1.1.38 Each standardized replaceable light source shall conform to the following requirements: (a) A silicone O-ring shall be provided. (b) The bulb portion of the standardized replaceable light source shall meet the requirements in paragraphs (b)(1) through (b)(6) of this section.

(1) The general specifications of the bulb shall be:

Low beam High beam Maximum power, watts at 2.8V (design voltage) 50 70

Lumens (without black cap) at 12.8 V design voltage 1.067 + 10% 1.738 + 10%

Average life at 14.0 V rated voltage (life testing 320 hrs 150 hrs as conducted in a finished headlamp assembly placed in the normal operating attitude)

(2) The bulb filaments shall be subject to seasoning prior to wattage and lumens measurement. (3) Wattage and lumens measurements shall be made with the direct current test voltage regulated within one quarter of one percent. (4) Except for reference dimensions, and unless otherwise specified, a general tolerance of +0.004 in. (0.10 mm) shall apply to all linear dimensions and +1o.00' shall apply to all angular dimensions. (5) Bulb, lead wires and/or terminals shall be installed in the base so as to provide an airtight seal. (6) After a bulb deflection test conducted in accordance with S7, the permanent deflection of the glass envelope of each standardized replaceable light source shall not exceed 0.005 inch (0.13 mm) in the direction of the