Interpretation ID: nht89-2.94

TYPE: INTERPRETATION-NHTSA

DATE: 09/06/89

FROM: MARGRET SCHMOCK -- ROBERT BOSCH

TO: R. VAN IDERSTINE -- NHTSA

TITLE: HIGH MOUNTED STOP LAMP

ATTACHMT: ATTACHED TO LETTER DATED 11/06/89 FROM STEPHEN P. WOOD -- NHTSA TO FRAU MARGRET SCHMOCK -- ROBERT BOSCH; REDBOOK A34; STANDARD 108

TEXT: Dear Mr. Van Iderstine,

Could you please answer to the following questions:

1. Is it allowed to use 6 wedge-base-bulbs (3cp) on one high mounted stop lamp?

2. SAE J186 Nov. 82 says that the effective projected luminous area shall not be less than 29 cm<2>.

How would you measure the projected luminous area of a lamp with 6 bulbs?

3. Must each bulb reach the required photometric values?

4. What will happen, if one bulb is defect?

Thank you very much in advance and all the best wishes,