What does lumen/sq. meter/steradian measure?

It measures luminance, indicating the brightness emitted or reflected by a surface per unit area and solid angle.

Why convert to the blondel unit?

Conversion to blondel helps interpret or compare brightness from early 20th-century photometric data where blondel was commonly used.

Is blondel still used today?

No, blondel has been replaced by the SI unit candela per square meter in modern practice.

How to Convert from Lumen/sq. meter/steradian to Blondel?

Learn to convert luminance values from lumen per square meter per steradian (lm·m⁻²·sr⁻¹) to the obsolete blondel unit, useful for interpreting historical photometric data.

Lumen/sq. meter/steradian

Blondel

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Lumen/sq. meter/steradian to Blondel Conversion Table

Lumen/sq. meter/steradian	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.

Lumen/sq. meter/steradian to Blondel Conversion Table
Lumen/sq. meter/steradian	Blondel

Explore More Luminance Units Converter

What Is This Tool?

This unit converter helps you translate luminance measurements from lumen per square meter per steradian to blondel. It is ideal for comparing contemporary brightness metrics with historical photometric records that use the blondel unit.

How to Use This Tool?

Enter the luminance value in lumen per square meter per steradian
Select blondel as the target unit
Click convert to see the equivalent value in blondel
Use the result to compare with historical photometry data

Key Features

Converts luminance values from lumen/sq. meter/steradian to blondel accurately
Supports analysis of historical photometric and lighting engineering data
Browser-based and easy to use without installation
Provides clear conversion examples for reference

Examples

1 lumen/sq. meter/steradian equals 3.1415926536 blondel
2 lumens/sq. meter/steradian equals 6.2831853072 blondel

Common Use Cases

Analyzing legacy photometric measurements in academic research
Comparing modern luminance readings with older lighting standards
Interpreting brightness levels reported in historical engineering literature

Tips & Best Practices

Use this conversion primarily for historical or comparative purposes
Verify the context of older data to ensure appropriate application
Keep in mind that the blondel is no longer a standard unit
Reference modern SI values alongside for clearer understanding

Limitations

Blondel is obsolete and rarely encountered in contemporary measurements
Conversion is mostly useful for interpreting historical records
Older data may have reduced precision and require cautious handling

Frequently Asked Questions

What does lumen/sq. meter/steradian measure?: It measures luminance, indicating the brightness emitted or reflected by a surface per unit area and solid angle.
Why convert to the blondel unit?: Conversion to blondel helps interpret or compare brightness from early 20th-century photometric data where blondel was commonly used.
Is blondel still used today?: No, blondel has been replaced by the SI unit candela per square meter in modern practice.

Key Terminology

Lumen/sq. meter/steradian: A unit of luminance measuring luminous intensity emitted or reflected per square meter per steradian, equivalent to candela per square meter.
Blondel: An outdated photometric unit of luminance named after André Blondel, replaced by candela per square meter.
Luminance: The photometric measure of the luminous intensity per unit area projected in a specific direction.

Quick Knowledge Check

What does the unit lumen/sq. meter/steradian quantify?

Surface area

Luminance

Luminosity distance

The blondel is:

A modern SI unit

An obsolete photometric unit

A unit of electric current

Why might someone convert luminance values to blondel?

To calculate new brightness levels

To compare historical photometric data

To measure temperature

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