The formula to calculate Watts (\(W\)) from Lumens (\(lm\)) is:
\[ W = \frac{lm}{lm/W} \]
Where:
Watts (W) measure the power consumption of a light source. Lumens (lm) measure the total amount of visible light emitted by a source. Luminous efficacy (lm/W) is a measure of how efficiently a light source converts power (watts) into visible light (lumens).
Let's assume the following values:
Using the formula:
\[ W = \frac{1000}{80} \]
Evaluating:
\[ W = 12.5 \]
The power consumption is 12.5 W.
| Lumens (lm) | 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 |