Why is the blondel unit considered obsolete?

Blondel was used in early 20th-century photometry but has been replaced by the standardized SI unit candela per square meter (cd/m²) in modern practices.

What is the exact conversion factor from candela/square meter to blondel?

One candela per square meter equals approximately 3.1415926536 blondel.

In which fields might I need to convert between these luminance units?

This conversion is relevant in photometry, lighting engineering, historical research, and when reconciling older measurement data with modern standards.

How to Convert from Candela/square meter to Blondel

Easily convert luminance values from candela per square meter to the historic blondel unit with this online converter. Understand the relationship, use cases, and limitations of this photometric transformation.

Candela/square meter

Blondel

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Candela/square meter to Blondel Conversion Table

Candela/square meter	Blondel

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Candela/square meter to Blondel Conversion Table
Candela/square meter	Blondel

Explore More Luminance Units Converter

What Is This Tool?

This converter transforms luminance measurements from candela per square meter (cd/m²), the modern SI unit, into blondel, an obsolete photometric unit once used to describe luminous intensity per unit area.

How to Use This Tool?

Enter the luminance value in candela per square meter you wish to convert.
Select candela/square meter as the input unit and blondel as the output unit.
Click convert to view the equivalent value in blondel based on the conversion factor.

Key Features

Converts luminance values from candela/square meter to blondel accurately using the defined conversion formula.
Useful for analyzing historical photometry data and comparing legacy measurements with modern standards.
Browser-based and simple to use without the need for additional software.

Examples

Converting 2 candela/square meters gives 6.2831853072 blondel.
Converting 0.5 candela/square meters results in 1.5707963268 blondel.

Common Use Cases

Interpreting historical brightness data recorded in blondel for documentation or research.
Comparing early 20th-century photometric measurements with modern luminance values in cd/m².
Supporting lighting engineering efforts where legacy standards reference the blondel unit.

Tips & Best Practices

Always use the precise conversion rate of 1 candela/square meter = 3.1415926536 blondel for accuracy.
Recognize that blondel is obsolete and mainly relevant for historical or comparative contexts.
Cross-check conversion results when using data from outdated sources due to varying reported values.

Limitations

Blondel is no longer used in contemporary scientific or industrial applications.
The converter relies on a fixed conversion factor which may not match inconsistent historical data exactly.
Modern measurements and instruments standardize on candela per square meter, limiting practical blondel usage.

Frequently Asked Questions

Why is the blondel unit considered obsolete?: Blondel was used in early 20th-century photometry but has been replaced by the standardized SI unit candela per square meter (cd/m²) in modern practices.
What is the exact conversion factor from candela/square meter to blondel?: One candela per square meter equals approximately 3.1415926536 blondel.
In which fields might I need to convert between these luminance units?: This conversion is relevant in photometry, lighting engineering, historical research, and when reconciling older measurement data with modern standards.

Key Terminology

Candela per square meter (cd/m²): The SI unit of luminance representing luminous intensity per unit area, used to quantify surface brightness.
Blondel: An obsolete unit of luminance formerly used in early photometry, now replaced by the candela per square meter.

Quick Knowledge Check

What modern SI unit does blondel correspond to?

Candela per lumen

Candela per square meter

Lux

What is the primary reason to convert from candela/square meter to blondel?

To measure modern display brightness

To interpret historical luminance measurements

To calibrate new lighting instruments

Which statement about the blondel unit is true?

It is commonly used in current lighting design

It is an outdated photometric unit replaced by cd/m²

It measures luminous flux

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