The ratio of the mean spherical candle power to the mean horizontal candle power is called _______.

Lighting Terms:

The ratio of the mean spherical candle power (MSCP) to the mean horizontal candle power (MHCP) is called the reduction factor.

Explanation of Options:

1. Utilization Factor:- The utilization factor is the ratio of the luminous flux received on the working plane to the luminous flux emitted by the light source. - It measures how effectively the emitted light is utilized in the desired area.

2. Lamp Efficiency: - Lamp efficiency is the ratio of the luminous flux emitted by the lamp to the power consumed by the lamp. - It evaluates the efficiency of a lamp in converting electrical power into visible light.

3. Reduction Factor: - The reduction factor is the ratio of the mean spherical candle power (MSCP) to the mean horizontal candle power (MHCP). - This factor indicates how the light intensity in all directions (spherical) compares to the light intensity in the horizontal plane.

4. Beam Factor: - The beam factor is the ratio of the total luminous flux emitted by a lamp to the flux emitted within a specific beam angle. - It describes the concentration of light within a certain angle, useful in applications like spotlights and focused lighting.

Conclusion:

The ratio of the mean spherical candle power to the mean horizontal candle power is called:

3) Reduction Factor