Point detail

For any lamp, the luminous intensities measured after one minute and after the light output from the special warning lamp has reached photometric stability (deviation of less than ±5 per cent in the last 15 minutes of operation) shall comply with the minimum and maximum requirements. The luminous intensity distribution after one minute of operation can be calculated by applying the ratio achieved at HV between one minute and at photometric stability.

For any lamp equipped with non-filament light source(s), the luminous intensities measured after one minute and after 30 minutes of operation shall comply with the minimum and maximum requirements. The luminous intensity distribution after one minute of operation can be calculated by applying the ratio achieved at HV between one minute and 30 minutes of operation.