Lux to Watt Calculator

Calculate Watts







Formula

The formula to calculate Watts (\(W\)) from Lux (\(lx\)) is:

\[ W = \frac{lx}{lm/W} \]

Where:

Definition

Watts (W) measure the power consumption of a light source. Lux (lx) is a measure of illuminance, the total amount of visible light illuminating a point on a surface. Luminous efficacy (lm/W) is a measure of how efficiently a light source converts power (watts) into visible light (lumens).

How to calculate Watts from Lux

Let's assume the following values:

Using the formula:

\[ W = \frac{500}{80} \]

Evaluating:

\[ W = 6.25 \]

The power consumption is 6.25 W.

Conversion Chart

Lux (lx) Luminous Efficacy (lm/W) Watts (W)
100 50 2.0000
100 60 1.6667
100 70 1.4286
100 80 1.2500
100 90 1.1111
100 100 1.0000
100 110 0.9091
100 120 0.8333
100 130 0.7692
100 140 0.7143
100 150 0.6667
200 50 4.0000
200 60 3.3333
200 70 2.8571
200 80 2.5000
200 90 2.2222
200 100 2.0000
200 110 1.8182
200 120 1.6667
200 130 1.5385
200 140 1.4286
200 150 1.3333
300 50 6.0000
300 60 5.0000
300 70 4.2857
300 80 3.7500
300 90 3.3333
300 100 3.0000
300 110 2.7273
300 120 2.5000
300 130 2.3077
300 140 2.1429
300 150 2.0000
400 50 8.0000
400 60 6.6667
400 70 5.7143
400 80 5.0000
400 90 4.4444
400 100 4.0000
400 110 3.6364
400 120 3.3333
400 130 3.0769
400 140 2.8571
400 150 2.6667
500 50 10.0000
500 60 8.3333
500 70 7.1429
500 80 6.2500
500 90 5.5556
500 100 5.0000
500 110 4.5455
500 120 4.1667
500 130 3.8462
500 140 3.5714
500 150 3.3333
600 50 12.0000
600 60 10.0000
600 70 8.5714
600 80 7.5000
600 90 6.6667
600 100 6.0000
600 110 5.4545
600 120 5.0000
600 130 4.6154
600 140 4.2857
600 150 4.0000
700 50 14.0000
700 60 11.6667
700 70 10.0000
700 80 8.7500
700 90 7.7778
700 100 7.0000
700 110 6.3636
700 120 5.8333
700 130 5.3846
700 140 5.0000
700 150 4.6667
800 50 16.0000
800 60 13.3333
800 70 11.4286
800 80 10.0000
800 90 8.8889
800 100 8.0000
800 110 7.2727
800 120 6.6667
800 130 6.1538
800 140 5.7143
800 150 5.3333
900 50 18.0000
900 60 15.0000
900 70 12.8571
900 80 11.2500
900 90 10.0000
900 100 9.0000
900 110 8.1818
900 120 7.5000
900 130 6.9231
900 140 6.4286
900 150 6.0000
1000 50 20.0000
1000 60 16.6667
1000 70 14.2857
1000 80 12.5000
1000 90 11.1111
1000 100 10.0000
1000 110 9.0909
1000 120 8.3333
1000 130 7.6923
1000 140 7.1429
1000 150 6.6667