| (a) For filament light sources the correction factor is the ratio between the reference luminous flux and the mean value of the luminous flux found at the voltage applied (13.2 V or 13.5 V); | a0c0 |
| (a) For filament light sources the correction factor is the ratio between the reference luminous flux and the mean value of the luminous flux found at the voltage applied (13.2 V or 13.5 V); | a0c0 |