Convert Candela Steradian to Watt at 555nm
Convert candela steradians to watts at 555nm by entering a value below.
How to Convert Candela Steradians to Watts at 555nm
The candela steradian and watt at 555nm are both units of luminous flux. By definition, 1 watt at 555nm equals exactly 683 candela steradians. This means to convert candela steradians to watts at 555nm, you divide by 683.
Formula
Step-by-Step Example
Convert 5 cd·sr to watts at 555nm:
We need to convert candela steradians to watts at 555nm
Since 1 W@555nm = 683 cd·sr, divide by 683
5 ÷ 683 = 0.0073206442
5 cd·sr = 0.0073206442 W@555nm
Candela Steradian to Watt at 555nm Conversion Table
Quick reference table for common candela steradian to watt at 555nm conversions. Click any value for detailed calculation.
| Candela Steradians (cd·sr) | Watts at 555nm (W@555nm) |
|---|---|
| 0.1 cd·sr | 0.0001464129 W@555nm |
| 0.5 cd·sr | 0.0007320644 W@555nm |
| 1 cd·sr | 0.0014641288 W@555nm |
| 2 cd·sr | 0.0029282577 W@555nm |
| 5 cd·sr | 0.0073206442 W@555nm |
| 10 cd·sr | 0.0146412884 W@555nm |
| 25 cd·sr | 0.0366032211 W@555nm |
| 50 cd·sr | 0.0732064422 W@555nm |
| 100 cd·sr | 0.1464128843 W@555nm |
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.
Watt at 555nm (W@555nm)
Watts at 555nm represents the peak luminous efficacy of radiation: exactly 683 lumens per watt at 555nm wavelength (green-yellow light where human eye is most sensitive). This fundamental constant links radiometric (watts) to photometric (lumens) measurements.
Frequently Asked Questions
How do I convert candela steradians to watts at 555nm?
To convert candela steradians to watts at 555nm, divide the value by 683. For example, 10 cd·sr = 0.0146412884 W@555nm.
How many watts at 555nm are in 1 candela steradian?
1 candela steradian equals 0.0014641288 watts at 555nm.
What is the formula for candela steradians to watts at 555nm?
The formula is: W@555nm = cd·sr ÷ 683.