ISO 2691:1987

Photography — Expendable photoflash lamps (without integral reflector) — Defintions and requirements for luminous flux/time characteristics

The specifications apply to photoflash lamps in which the light is produced by a combustion within a transparent envelope, initiated by an electrical contact. the important time intervals of the luminous flux/time characteristics for such lamps are given, and the lamps are classified on the basis of these intervals.