#### Watts to Lumens :

W | ||

lm/W | ||

lm |

##### Watts :

- The watt is a unit of power or radiant flux.In the International System of Units and then it is defined as a derived unit of 1 kg·m²·s³ or, equivalently, 1 joule per second.
- It is used to quantify the rate of energy transfer.
- Then, the symbol fo watts is
**W**.

##### Lumens :

- The lumen is the unit of luminous flux, a measure of the total quantity of visible light emitted by a source per unit of time, in the International System of Units.
- Then, the symbol of lumens is
**lm**.

##### Watts to Lumens :

- A source radiating a power of one watt of light in the color for which the eye is most efficient (a wavelength of 555 nm, in the green region of the optical spectrum) has luminous flux of 683 lumens.
- So a lumen represents at least 1/683 watts of visible light power, depending on the spectral distribution.

##### Formula :

- The formula used to calculate the following calculator watts to lumens is given below.
- Whether, Select the light source or Enter luminous efficacy in lumens per watt.
- Then, the calculation formula = Power in watts * Luminous efficacy in lumens per watt.
- Besides the formula this calculator works.

##### How to Calculate ?

- First, Enter the Power in watts.
- Second, Select the light source or Enter Luminous efficacy in lumens per watt.
- Click “Calculate” to get the result and then if you want to clear values Click “Reset” in addition to clear the values.
- Finally, follow these steps to get the results.
- Then you will get as a Luminous flex result in lumens.