Luminous Intensity / cd → lm/sr
Convert Candelas to Lumens per steradian
Convert luminous intensity in candela and SI multiples. Convert Candelas (cd) to Lumens per steradian (lm/sr). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Lumens per steradian to Candelas →
How to convert candelas to lumens per steradian
A candela equals one lumen per steradian. Total lumens require a known angular distribution; watts require spectral luminous efficacy. Obsolete candle standards are deliberately excluded.
Use x for the value in cd, b for the intermediate value in cd, and y for the result in lm/sr.
lm/sr = cd
Worked examples
10 cd ≈ 10 lm/sr
Step 1: (10 × 1) ≈ 10 cd.
Step 2: 10 ÷ 1 ≈ 10 lm/sr.20 cd ≈ 20 lm/sr
Step 1: (20 × 1) ≈ 20 cd.
Step 2: 20 ÷ 1 ≈ 20 lm/sr.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Candelas
Candelas (cd) measures luminous intensity under the conventions above. The base value in cd is (x × 1), where x is the numerical value in cd. Factors shown here are rounded for display; calculations use the stored factor.
About Lumens per steradian
Lumens per steradian (lm/sr) measures luminous intensity under the conventions above. The base value in cd is (x × 1), where x is the numerical value in lm/sr. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Candelas to lumens per steradian reference table
| Candelas (cd) | Lumens per steradian (lm/sr) |
|---|---|
| 1 | 1 |
| 5 | 5 |
| 10 | 10 |
| 25 | 25 |
| 50 | 50 |
| 100 | 100 |
| 1000 | 1000 |
Browse every luminous intensity conversion →