What does candela per square meter measure?

Candela per square meter quantifies luminance as the luminous intensity emitted or reflected by a surface per unit projected area in a given direction.

Why use apostilb for luminance?

Apostilb is useful for referencing historical photometric data and old cinematography specifications where this unit was commonly applied.

Is the apostilb recognized in modern standards?

No, apostilb is a non-SI and historical unit and it may not be recognized in current regulatory frameworks.

How to Convert from Candela/square meter to Apostilb

Learn how to convert luminance values from candela per square meter, the SI unit of brightness, to apostilb, a historical photometric unit. This guide explains the conversion process, use cases, and practical examples.

Candela/square meter

Apostilb

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

Candela/square meter to Apostilb Conversion Table

Candela/square meter	Apostilb

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 Apostilb Conversion Table
Candela/square meter	Apostilb

Explore More Luminance Units Converter

What Is This Tool?

This tool helps convert luminance measurements from candela per square meter (cd/m²) to apostilb (asb), enabling users to translate modern brightness values into an older unit commonly used in historical photometric data and cinematography.

How to Use This Tool?

Enter the luminance value in candela per square meter.
Select 'candela/square meter' as the input unit and 'apostilb' as the output unit.
Click convert to see the luminance expressed in apostilb.

Key Features

Converts luminance from candela per square meter to apostilb accurately using the defined conversion formula.
Supports understanding of display brightness and lighting design across different measurement units.
Facilitates integration of contemporary and historical luminance data for research and calibration.

Examples

5 Candela/square meter = 5 × 3.1415926536 = 15.707963268 Apostilb
0.5 Candela/square meter = 0.5 × 3.1415926536 = 1.570796327 Apostilb

Common Use Cases

Translating modern SI luminance values for compatibility with older photometric data.
Comparing brightness specifications in cinematography that use apostilb.
Calibrating imaging equipment with reference to historical luminance units.

Tips & Best Practices

Use this tool when working with legacy photometric or cinematography measurements.
Ensure precise input of values to maintain conversion accuracy based on π.
Consider measurement geometry differences when interpreting converted luminance results.

Limitations

Apostilb is a non-SI, historical unit and may not be accepted by modern standards.
Conversion relies on π; any approximation might slightly impact results.
Variants in measurement conditions may cause discrepancies between units.

Frequently Asked Questions

What does candela per square meter measure?: Candela per square meter quantifies luminance as the luminous intensity emitted or reflected by a surface per unit projected area in a given direction.
Why use apostilb for luminance?: Apostilb is useful for referencing historical photometric data and old cinematography specifications where this unit was commonly applied.
Is the apostilb recognized in modern standards?: No, apostilb is a non-SI and historical unit and it may not be recognized in current regulatory frameworks.

Key Terminology

Candela per square meter: An SI unit of luminance indicating luminous intensity per unit area in a specified direction, often called a 'nit'.
Apostilb: A non-SI, historical unit of luminance equal to 1 divided by π candela per square meter, used in older photometric measurements.
Luminance: A measure of luminous intensity emitted or reflected from a surface per unit projected area in a given direction.

Quick Knowledge Check

Which unit is the SI standard for luminance?

Apostilb

Candela per square meter

Lux

What is the relationship between candela per square meter and apostilb?

1 cd/m² = π apostilb

1 apostilb = π cd/m²

The units are equal

In which field is apostilb still significant?

Modern electronics manufacturing

Historical photometric research

Contemporary architecture design

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