Which has more luminous efficiency

The yellow colour has a greater luminous efficiency as compared to the other colours. Can we increase the illuminating power of a white light source by putting a yellow plastic paper around this source ?

The yellow colour has a greater luminous efficiency as compared to the other colours. Can we increase the illuminating power of a white light source by putting a yellow plastic paper around this source ?

The yellow colour has a greater luminous efficiency as compared to the other colours. Can we increase the illuminating power of a white light source by putting a yellow plastic paper around this source ?

Why is the luminous efficiency small for a filament bulb as compared to a mercury vapour lamp ?

Why is the luminous efficiency small for a filament bulb as compared to a mercury vapour lamp ?

Why is the luminous efficiency small for a filament bulb as compared to a mercury vapour lamp ?

A source emits 31.4 W of radiant flux distributed uniformly in all directions. The luminous efficiency is 60 lumen watt. What is the luminous intensity of the source ?

A source emits 31.4 W of radiant flux distributed uniformly in all directions. The luminous efficiency is 60 lumen watfi. What is the luminous intensity of the source ?

A source emits 31.4 W of radiant flux distributed uniformly in all directions. The luminous efficiency is 60 lumen watt. What is the luminous intensity of the source ?