Understanding Lumen/watt Unit
The unit 'Lumen/watt' signifies the ratio between the luminous flux output of a light source and the electrical power it consumes.
- Lumen (lm): This measures luminous flux, the total quantity of visible light emitted by a source.
- Watt (W): This measures the rate of energy consumption, or power.
The calculation is expressed as: \text{Lumen/watt} = \frac{\text{Luminous Flux (lm)}}{\text{Power (W)}}$
This value indicates how efficiently a light source converts electrical energy into light. This measure of efficiency is precisely what defines luminous efficiency.
Therefore, Lumen/watt is the unit used to quantify luminous efficiency.
Important Questions from Physical Quantities
Kilowatt-hour (kWh) represents the unit of which of the following?
Which line on a meteorological map connects points of the same atmospheric pressure?
Which one of the following is a commercial unit of Energy ?
The energy $U$ stored in an inductor carrying a current $I$ is related to the magnetic flux $\Phi_B$ by the expression $U = \frac{1}{2} \Phi_B I$. What is the dimensional formula of magnetic flux ($\Phi_B$)?
Which of the following is a scalar quantity?
