Convert Lumens to cd·sr
Input the number of lumens you want to convert to candela steradians.
How to Convert Lumens to Candela Steradians
The lumen and candela steradian are both units of luminous flux. By definition, 1 lumen equals exactly 1 candela steradians. This means to convert lumens to candela steradians, you multiply by 1.
Formula
Step-by-Step Example
Convert 5 lm to candela steradians:
We need to convert lumens to candela steradians
Since 1 lm = 1 cd·sr, multiply by 1
5 × 1 = 5
5 lm = 5 cd·sr
Lumen to Candela Steradian Conversion Table
Quick reference table for common lumen to candela steradian conversions. Click any value for detailed calculation.
| Lumens (lm) | Candela Steradians (cd·sr) |
|---|---|
| 1 lm | 1 cd·sr |
| 2 lm | 2 cd·sr |
| 5 lm | 5 cd·sr |
| 10 lm | 10 cd·sr |
| 15 lm | 15 cd·sr |
| 20 lm | 20 cd·sr |
| 25 lm | 25 cd·sr |
| 50 lm | 50 cd·sr |
| 100 lm | 100 cd·sr |
About These Units
Lumen (lm)
The lumen (lm) is the SI unit of luminous flux, measuring total visible light output from a source. Common bulb outputs: 40W incandescent ≈ 450 lm, 60W equivalent LED ≈ 800 lm, 100W equivalent ≈ 1,600 lm. Projector: 3,000-10,000 lm. One lumen = one candela × one steradian.
Candela Steradian (cd·sr)
A candela steradian (cd·sr) is the defining relationship for lumens: 1 lumen = 1 candela × 1 steradian. Shows how luminous flux relates to luminous intensity (candelas) and solid angle (steradians). A sphere has 4π ≈ 12.57 steradians total solid angle.
Frequently Asked Questions
How do I convert lumens to candela steradians?
To convert lumens to candela steradians, multiply the value by 1. For example, 10 lm = 10 cd·sr.
How many candela steradians are in 1 lumen?
1 lumen equals 1 candela steradians.
What is the formula for lumens to candela steradians?
The formula is: cd·sr = lm × 1.