BS 5550-7.1.1:1980

Co-operating organizations
Foreword
Section 1. General
1 Scope
2 Definitions
Section 2. Requirements
3 General
4 Standard exciter lamps
5 Dimensions
6 Filament dimensions
7 Bulbs
8 Caps
9 Microphonic noise
10 Marking
Section 3. Batch testing procedure
11 Principles of sampling
12 Inspection test quantity (I.T.Q.)
13 Rating test quantity (R.T.Q.)
14 Life test quantity (L.T.Q.)
15 Position of operation
16 Ageing
17 Photometry
18 Life test
19 Measurements during life test (Lumen output maintenance)
Section 4. Requirements for compliance
20 General
21 Mechanical and physical requirements
22 Initial readings
23 Lumen output maintenance
24 Life performance
Appendix A - Statistical basis of the test quantities in
             section 3, and the conditions of compliance
             in section 4 of the specification
Appendix B - Holders for torsion test

Dimensions, optical performance of five types of lamp for 16 mm and 35 mm cinematograph projectors and similar applications. Lamps with bayonet and pre-focus caps, bulbs of pear and tubular shape, transverse and axial filaments. Values for initial light output and current consumption, minimum lumen output maintenance, hours life. Sampling batch testing.

This British Standard covers exciter lamps for 16 mm and 35 mm motion picture projectors, as shown in Table 1.