Petalumens to exalumens converter
Convert petalumens (Plm) to exalumens (Elm). Calculate any value, follow the unit-factor steps and check a conversion table.
Updated · How we checkUse a decimal point, such as 2.5. Enter a value in Plm; the result is in Elm.
Formula
Worked example
Convert 1 Plm to Elm:
1 Plm ≈ 0.001 Elm
Multiply your Plm value by the factor above. The calculator uses the full conversion factor before rounding the displayed answer.
Petalumens to exalumens table
Reference values rounded to 10 significant digits. Use the converter above for other amounts.
| Petalumens (Plm) | Exalumens (Elm) |
|---|---|
| 0.1 | ≈ 0.0001 |
| 0.5 | ≈ 0.0005 |
| 1 | ≈ 0.001 |
| 2 | ≈ 0.002 |
| 5 | ≈ 0.005 |
| 10 | ≈ 0.01 |
| 25 | ≈ 0.025 |
| 50 | ≈ 0.05 |
| 100 | ≈ 0.1 |
| 1000 | ≈ 1 |
What petalumens measure
Petalumens (Plm) represent luminous flux. One unit equals 10^15 lm. One lumen equals one candela-steradian and measures photometrically weighted luminous flux.
Reading the result in exalumens
Exalumens (Elm) represent luminous flux. One unit equals 10^18 lm. One lumen equals one candela-steradian and measures photometrically weighted luminous flux.
Where this conversion helps
Express total luminous output using the same decimal scale. Lumens do not directly measure electrical power or illuminance at a surface; efficacy and geometry matter.
How the scale changes
The input unit has a factor of 1e15 lm; the output unit has a factor of 1e18 lm. Multiply the entered number by the input factor, then divide by the output factor. The physical quantity stays the same while its numerical representation changes.
Reading very small or large results
Scientific notation keeps very small and large values readable: 2.5e-6 means 0.0000025. The converter calculates with 50 significant digits internally and displays up to 10. Exact unit definitions do not remove uncertainty from the original measurement.
References
Definitions and method references. Example rates and prices on this page are editable assumptions.