The formula to calculate Lux (\(lx\)) from Candela (\(cd\)) is:
\[ lx = \frac{cd}{d^2} \]
Where:
Lux (lx) is a measure of illuminance, the total amount of visible light illuminating a point on a surface. Candela (cd) measures the luminous intensity in a specific direction.
The distance is the space between the light source and the point where the illuminance is measured.
Let's assume the following values:
Using the formula:
\[ lx = \frac{100}{2^2} \]
Evaluating:
\[ lx = \frac{100}{4} = 25 \]
The Lux is 25 lx.
| Candela (cd) | Distance (meters) | Lux (lx) |
|---|---|---|
| 10 | 1 | 10.0000 |
| 10 | 2 | 2.5000 |
| 10 | 3 | 1.1111 |
| 10 | 4 | 0.6250 |
| 10 | 5 | 0.4000 |
| 10 | 6 | 0.2778 |
| 10 | 7 | 0.2041 |
| 10 | 8 | 0.1563 |
| 10 | 9 | 0.1235 |
| 10 | 10 | 0.1000 |
| 20 | 1 | 20.0000 |
| 20 | 2 | 5.0000 |
| 20 | 3 | 2.2222 |
| 20 | 4 | 1.2500 |
| 20 | 5 | 0.8000 |
| 20 | 6 | 0.5556 |
| 20 | 7 | 0.4082 |
| 20 | 8 | 0.3125 |
| 20 | 9 | 0.2469 |
| 20 | 10 | 0.2000 |
| 30 | 1 | 30.0000 |
| 30 | 2 | 7.5000 |
| 30 | 3 | 3.3333 |
| 30 | 4 | 1.8750 |
| 30 | 5 | 1.2000 |
| 30 | 6 | 0.8333 |
| 30 | 7 | 0.6122 |
| 30 | 8 | 0.4688 |
| 30 | 9 | 0.3704 |
| 30 | 10 | 0.3000 |
| 40 | 1 | 40.0000 |
| 40 | 2 | 10.0000 |
| 40 | 3 | 4.4444 |
| 40 | 4 | 2.5000 |
| 40 | 5 | 1.6000 |
| 40 | 6 | 1.1111 |
| 40 | 7 | 0.8163 |
| 40 | 8 | 0.6250 |
| 40 | 9 | 0.4938 |
| 40 | 10 | 0.4000 |
| 50 | 1 | 50.0000 |
| 50 | 2 | 12.5000 |
| 50 | 3 | 5.5556 |
| 50 | 4 | 3.1250 |
| 50 | 5 | 2.0000 |
| 50 | 6 | 1.3889 |
| 50 | 7 | 1.0204 |
| 50 | 8 | 0.7813 |
| 50 | 9 | 0.6173 |
| 50 | 10 | 0.5000 |
| 60 | 1 | 60.0000 |
| 60 | 2 | 15.0000 |
| 60 | 3 | 6.6667 |
| 60 | 4 | 3.7500 |
| 60 | 5 | 2.4000 |
| 60 | 6 | 1.6667 |
| 60 | 7 | 1.2245 |
| 60 | 8 | 0.9375 |
| 60 | 9 | 0.7407 |
| 60 | 10 | 0.6000 |
| 70 | 1 | 70.0000 |
| 70 | 2 | 17.5000 |
| 70 | 3 | 7.7778 |
| 70 | 4 | 4.3750 |
| 70 | 5 | 2.8000 |
| 70 | 6 | 1.9444 |
| 70 | 7 | 1.4286 |
| 70 | 8 | 1.0938 |
| 70 | 9 | 0.8642 |
| 70 | 10 | 0.7000 |
| 80 | 1 | 80.0000 |
| 80 | 2 | 20.0000 |
| 80 | 3 | 8.8889 |
| 80 | 4 | 5.0000 |
| 80 | 5 | 3.2000 |
| 80 | 6 | 2.2222 |
| 80 | 7 | 1.6327 |
| 80 | 8 | 1.2500 |
| 80 | 9 | 0.9877 |
| 80 | 10 | 0.8000 |
| 90 | 1 | 90.0000 |
| 90 | 2 | 22.5000 |
| 90 | 3 | 10.0000 |
| 90 | 4 | 5.6250 |
| 90 | 5 | 3.6000 |
| 90 | 6 | 2.5000 |
| 90 | 7 | 1.8367 |
| 90 | 8 | 1.4063 |
| 90 | 9 | 1.1111 |
| 90 | 10 | 0.9000 |
| 100 | 1 | 100.0000 |
| 100 | 2 | 25.0000 |
| 100 | 3 | 11.1111 |
| 100 | 4 | 6.2500 |
| 100 | 5 | 4.0000 |
| 100 | 6 | 2.7778 |
| 100 | 7 | 2.0408 |
| 100 | 8 | 1.5625 |
| 100 | 9 | 1.2346 |
| 100 | 10 | 1.0000 |