Utilization of Electrical Energy Illumination

Which of the following relations is correct?

1
Mean spherical candle power = 1/(Mean horizontal candle power × Reduction factor)
2
Mean spherical candle power = Mean horizontal candle power × Reduction factor
3
Mean spherical candle power = Reduction factor / Mean horizontal candle power
4
Mean spherical candle power = Mean horizontal candle power / Reduction factor

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