Lumen per Square Foot Steradian to Watt per Square Centimeter Steradian (at 555 nm) Conversion
Convert between Lumen per Square Foot Steradian and Watt per Square Centimeter Steradian (at 555 nm) quickly and accurately.
How to Convert Lumen per Square Foot Steradian to Watt per Square Centimeter Steradian (at 555 nm)
Conversion Formula
Example
Convert 15 lm/(ft²·sr) to W/(cm²·sr):
Unit Information
Learn about the luminance units you're converting between
Lumen per Square Foot Steradian
lm/(ft²·sr)
Definition
The Lumen per Square Foot Steradian is an imperial unit of luminance that shows the relationship between luminous flux, area, and solid angle using square feet. It is equivalent to 10.7639104167 candela per square meter.
History/Origin
This unit was developed for use in countries employing imperial measurements, providing a way to express luminance in terms of square feet while maintaining the relationship to luminous flux and solid angle. It bridges metric and imperial systems in lighting applications.
Current Use
Used in lighting design and engineering in countries using imperial units, particularly in architectural lighting and display specifications. Common in applications where square footage is the standard area measurement and precise luminance control is required.
Multiplier
10.764
Offset
0
Watt per Square Centimeter Steradian (at 555 nm)
W/(cm²·sr)
Definition
The Watt per Square Centimeter Steradian at 555 nm is a radiometric unit of luminance that measures radiant power per unit area and solid angle at the peak sensitivity wavelength of the human eye. It is used for precise photometric calculations and laser applications.
History/Origin
This unit was developed for applications requiring precise conversion between radiometric and photometric quantities. The 555 nm wavelength corresponds to the peak sensitivity of the human eye, making it ideal for accurate photometric measurements and laser safety calculations.
Current Use
Used in laser safety, precision photometry, and applications requiring exact conversion between radiometric and photometric units. Essential for laser power measurements, optical system design, and safety calculations where precise luminance values are critical.
Multiplier
6830000
Offset
0
Lumen per Square Foot Steradian to Watt per Square Centimeter Steradian (at 555 nm) Conversion Table
| Lumen per Square Foot Steradian [lm/(ft²·sr)] | Watt per Square Centimeter Steradian (at 555 nm) [W/(cm²·sr)] |
|---|---|
| 1 lm/(ft²·sr) | 0.000002 W/(cm²·sr) |
| 10 lm/(ft²·sr) | 0.000016 W/(cm²·sr) |
| 25 lm/(ft²·sr) | 0.000039 W/(cm²·sr) |
| 50 lm/(ft²·sr) | 0.000079 W/(cm²·sr) |
| 100 lm/(ft²·sr) | 0.000158 W/(cm²·sr) |
| 0 lm/(ft²·sr) | 0E+0 W/(cm²·sr) |
| -10 lm/(ft²·sr) | -0.000016 W/(cm²·sr) |
| -40 lm/(ft²·sr) | -0.000063 W/(cm²·sr) |
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