Lux to watts calculator

Illuminance in lux (lx) to electric power in watts (W) calculator and how to calculate.

Enter the illuminance in lux, luminous efficacy in lumens per watt, surface area in square feet / meters or spherical radius in feet / meters and press the Calculate button to get the power in watts:

Enter illuminance in lux:  
lx
Select light source:
Or enter luminous efficacy in lumens per watt:
lm/W
Enter surface area:  
Or enter spherical radius:  
   
 
   
Power  result in watts:  
W

Watts to lux calculator ►

* the predefined luminous efficacy values are typical / average values.

Lux to watts calculation formula

Lux to watts calculation with area in square feet

So The luminous flux ΦV in lumens (lm) is equal to 0.09290304 times the illuminance Ev in lux (lx) times the surface area A in square feet (ft2).

ΦV(lm) = 0.09290304 × Ev(lx) × A(ft2)

 

So The power P in watts (W) is equal to the luminous flux ΦV in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W).

P(W) = ΦV(lm) / η(lm/W)

 

So the power P in watts (W) is equal to the 0.09290304 times the illuminance Ev in lux (lx) times the surface area A in square feet (ft2), divided by the luminous efficacy η in lumens per watt (lm/W).

P(W) = 0.09290304 × Ev(lx) × A(ft2) / η(lm/W)

So

watts = 0.09290304 × lux × (square feet) / (lumens per watt)

or

W = 0.09290304 × lx × ft2 / (lm/W)

Example 1

What is the power consumption with illuminance of 40 lux, luminous efficacy of 15 lumens per watt and surface area of 300 square feet?

P = 0.09290304 × 40 lx × 300 ft2 / 15 lm/W = 74.32 W

Example 2

What is the power consumption with illuminance of 60 lux, luminous efficacy of 15 lumens per watt and surface area of 300 square feet?

P = 0.09290304 × 60 lx × 300 ft2 / 15 lm/W = 111.48 W

Example 3

What is the power consumption with illuminance of 100 lux, luminous efficacy of 15 lumens per watt and surface area of 300 square feet?

P = 0.09290304 × 100 lx × 300 ft2 / 15 lm/W =185.80 W

Lux to watts calculation with area in square meters

The luminous flux ΦV in lumens (lm) is equal to the illuminance Ev in lux (lx) times the surface area A in square meters (m2).

ΦV(lm) = Ev(lx) × A(m2)

 

The power P in watts (W) is equal to the luminous flux ΦV in lumens (lm), divided by the luminous efficacy η in lumens per watt (lm/W):

P(W) = ΦV(lm) / η(lm/W)

 

So the power P in watts (W) is equal to the illuminance Ev in lux (lx) times the surface area A in square meters (m2), divided by the luminous efficacy η in lumens per watt (lm/W):

P(W) = Ev(lx) × A(m2) / η(lm/W)

So

watts = lux × (square meters) / (lumens per watt)

or

W = lx × m2 / (lm/W)

Example 1

What is the power consumption with illuminance of 40 lux, luminous efficacy of 16lumens per watt and surface area of 18 square meters?

P = 40 lx × 18 m2 / 16 lm/W = 45W

Example 2

What is the power consumption with illuminance of 60 lux, luminous efficacy of 16 lumens per watt and surface area of 18 square meters?

P = 60 lx × 18 m2 / 16 lm/W = 67.5W

Example 3

What is the power consumption with illuminance of 100 lux, luminous efficacy of 16 lumens per watt and surface area of 18 square meters?

P = 100 lx × 18 m2 / 16 lm/W = 112.5W

 

 

 

Lux to watts calculation ►

 


See also

Features of Lux to watts Calculator

Our Lux to watts Calculator allows the users to Calculate Lux to watts . Some of the prominent features of this utility are explained below.

No Registration

You don’t need to go through any registration process to use the Lux to watts Calculator. Using this utility, users to Calculate Lux to watts as many times as you want for free.

Fast conversion

This Lux to watts Calculator offers users the fastest Calculate. Once the user enters the  Lux to watts values ​​in the input field and clicks the Calculate button, the utility will start the conversion process and return the results immediately.

Saves Time and Effort

The manual procedure of Calculator Lux to watts isn’t an easy task. You must spend a lot of time and effort to complete this task. The Lux to watts Calculator allows you to complete the same task immediately. You will not be asked to follow manual procedures, as its automated algorithms will do the work for you.

Accuracy

Despite investing time and effort in manual Calculation, you might not be able to get your hands on accurate results. Not everyone is good at solving math problems, even if you think you're a pro, there's still a good chance you'll get in accurate results. This situation can be smartly handled with the help of a Lux to watts Calculator. You will be provided with 100% accurate results by this online tool.

Compatibility

The online Lux to watts converter perfectly works on all operating systems. Whether you have a Mac, iOS, Android, Windows, or Linux device, you can easily use this online Tool without facing any hassle.

100% Free

You don't need to go through any registration process to use this Lux to watts Calculator. You can use this utility for free and do unlimited Lux to watts Calculate without any limitations.

Advertising

LIGHTING CALCULATORS
°• CmtoInchesConvert.com •°