ISO 2827:1988 Preview
Photography -- Electronic flash equipment -- Determination of light output and performance
This standard was last reviewed and confirmed* in 2015.
*Therefore this version remains current
Specified are methods of measurements and standards of performance for light output, angle of coverage, ready indication, recycle time and number of flashes for electronic flash equipment of the single flash type, which is primarily intended to provide illumination for photography with cameras in which the contacts that control the flash are closed when the camera shutter is fully or nearly fully open.