Why convert from foot-lambert to blondel?

Conversion helps interpret luminance values from historical photometric literature and allows comparison with older measurement standards.

What is a foot-lambert?

A foot-lambert is an imperial luminance unit measuring luminous intensity per projected area, frequently used to specify cinema and projection screen brightness.

Is blondel still used today?

No, blondel is an obsolete unit replaced by the SI unit candela per square metre; it is mainly used for historical reference.

How to Convert from Foot-lambert [fL] to Blondel?

Convert luminance measurements easily from foot-lambert (fL) to the historical unit blondel using a simple conversion factor for photometric and lighting engineering applications.

Foot-lambert [fL]

Blondel

Please check your input. It must be a valid numeric value.

Foot-lambert [fL] to Blondel Conversion Table

Foot-lambert [fL]	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.

Foot-lambert [fL] to Blondel Conversion Table
Foot-lambert [fL]	Blondel

Explore More Luminance Units Converter

What Is This Tool?

This tool converts luminance values from foot-lambert (fL), a common unit in cinema and projection systems, to blondel, an older photometric unit now mainly used for historical reference.

How to Use This Tool?

Enter the luminance value in foot-lambert (fL) into the input field
Select foot-lambert as the starting unit and blondel as the target unit
Click the convert button to obtain the equivalent luminance in blondel
Use the result to understand or compare luminance from historical or legacy sources

Key Features

Accurate conversion from foot-lambert to the obsolete blondel unit
Supports interpretation of historical photometric data
Simple formula based on a fixed conversion rate
Ideal for professionals in lighting engineering and projection calibration

Examples

2 foot-lamberts [fL] converts to 21.5278208334 blondel
0.5 foot-lamberts [fL] converts to 5.38195520835 blondel

Common Use Cases

Calibrating cinema and home theater projection brightness
Translating historical photometric measurements into modern units
Comparing screen luminance specifications using imperial brightness units
Researching early 20th-century lighting engineering publications

Tips & Best Practices

Double-check units when working with mixed historical and modern data
Use this tool primarily for archival and compliance purposes
Convert legacy documentation to enable comparison with current standards
Remember that blondel is obsolete; modern work typically prefers SI units

Limitations

The blondel unit is outdated and rarely used in contemporary practice
Conversion results are mainly for historical comparison purposes
Rounding errors in legacy data may affect precision
Modern standards favor candela per square metre (cd/m²) for luminance

Frequently Asked Questions

Why convert from foot-lambert to blondel?: Conversion helps interpret luminance values from historical photometric literature and allows comparison with older measurement standards.
What is a foot-lambert?: A foot-lambert is an imperial luminance unit measuring luminous intensity per projected area, frequently used to specify cinema and projection screen brightness.
Is blondel still used today?: No, blondel is an obsolete unit replaced by the SI unit candela per square metre; it is mainly used for historical reference.

Key Terminology

Foot-lambert (fL): An imperial luminance unit equal to approximately 1/π candela per square foot, used to measure screen brightness and reflected light.
Blondel: An obsolete photometric unit of luminance named after André Blondel, used mainly in early 20th-century lighting measurements.
Luminance: A photometric measure of luminous intensity emitted or reflected from a surface per unit area in a given direction.

Quick Knowledge Check

What does the foot-lambert unit measure?

Light wavelength

Luminance or brightness

Electrical current

Why is blondel considered obsolete?

It was never widely adopted

It has been replaced by the candela per square metre (cd/m²)

It only measures luminous flux

When would you convert foot-lambert to blondel?

For historical data comparison

For modern cinema calibration

For measuring light frequency

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