Convert cd·sr to Lumens
Enter the number of candela steradians that you want to convert to lumens.
How to Convert Candela Steradians to Lumens
The candela steradian and lumen are both units of luminous flux. By definition, 1 candela steradian equals exactly 1 lumens. This means to convert candela steradians to lumens, you multiply by 1.
Formula
Step-by-Step Example
Convert 5 cd·sr to lumens:
We need to convert candela steradians to lumens
Since 1 cd·sr = 1 lm, multiply by 1
5 × 1 = 5
5 cd·sr = 5 lm
Candela Steradian to Lumen Conversion Table
Quick reference table for common candela steradian to lumen conversions. Click any value for detailed calculation.
| Candela Steradians (cd·sr) | Lumens (lm) |
|---|---|
| 1 cd·sr | 1 lm |
| 2 cd·sr | 2 lm |
| 5 cd·sr | 5 lm |
| 10 cd·sr | 10 lm |
| 15 cd·sr | 15 lm |
| 20 cd·sr | 20 lm |
| 25 cd·sr | 25 lm |
| 50 cd·sr | 50 lm |
| 100 cd·sr | 100 lm |
About These Units
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.
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.
Frequently Asked Questions
How do I convert candela steradians to lumens?
To convert candela steradians to lumens, multiply the value by 1. For example, 10 cd·sr = 10 lm.
How many lumens are in 1 candela steradian?
1 candela steradian equals 1 lumens.
What is the formula for candela steradians to lumens?
The formula is: lm = cd·sr × 1.