What does candela per square foot measure?

Candela per square foot measures luminance, describing the apparent brightness of a surface per unit area in square feet, commonly used with imperial area measurements.

Why convert candela/square foot to apostilb?

Converting to apostilb helps compare luminance values with historical photometric data and supports legacy calibration systems preferring this unit.

Is apostilb still commonly used today?

Apostilb is mostly a historical unit and is less common in contemporary standards but remains important for reference in older literature and some photometric research.

How to Convert from Candela/square foot to Apostilb

Learn how to convert luminance values from candela per square foot to apostilb, two non-SI units used in photometry and lighting design. Understand their definitions, typical use cases, and the conversion process.

Candela/square foot

Apostilb

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Candela/square foot to Apostilb Conversion Table

Candela/square foot	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 foot to Apostilb Conversion Table
Candela/square foot	Apostilb

Explore More Luminance Units Converter

What Is This Tool?

This tool converts luminance values from candela per square foot, an imperial unit expressing brightness per square foot, to apostilb, a historical photometric unit related to candela per square meter. It helps translate brightness measurements between these two units used in specialized lighting and display contexts.

How to Use This Tool?

Enter the luminance value in candela per square foot.
Select the 'candela/square foot' as the original unit.
Choose 'apostilb' as the target unit.
Click convert to obtain the value in apostilb.
Review the converted luminance value for your specific application.

Key Features

Converts luminance from candela/square foot to apostilb accurately.
Supports usage in cinema, theater, and lighting industry applications.
Facilitates legacy data interpretation by converting to a historical unit.
Browser-based and easy to use with simple inputs.
Shows example conversions for clarity.

Examples

2 candela/square foot converts to 67.631643778 apostilb.
0.5 candela/square foot converts to 16.907910945 apostilb.

Common Use Cases

Measuring and specifying monitor or display brightness using imperial area units.
Calibrating luminance on cinema and theater projection screens.
Assessing lighting designs and signage where square-foot area units apply.
Converting legacy photometric data reported in apostilb for comparison.
Referencing historical luminance specifications in lighting engineering.

Tips & Best Practices

Confirm unit bases since candela/square foot uses imperial area while apostilb uses metric.
Use this conversion for cross-referencing between modern and historical luminance standards.
Consider the projection direction and measurement assumptions of each unit.
Apply in contexts such as display brightness assessment and projection calibration.
Check for unit consistency when working with multiple photometric measurements.

Limitations

Both candela/square foot and apostilb are non-SI units which may reduce standardization.
Apostilb is largely historical and less frequent in modern measurement standards.
Differences in unit area bases (square foot vs. square meter) require careful attention.
Directional versus projected area assumptions may change results in complex lighting.
Precision may vary due to the non-standard nature of these units.

Frequently Asked Questions

What does candela per square foot measure?: Candela per square foot measures luminance, describing the apparent brightness of a surface per unit area in square feet, commonly used with imperial area measurements.
Why convert candela/square foot to apostilb?: Converting to apostilb helps compare luminance values with historical photometric data and supports legacy calibration systems preferring this unit.
Is apostilb still commonly used today?: Apostilb is mostly a historical unit and is less common in contemporary standards but remains important for reference in older literature and some photometric research.

Key Terminology

Candela per square foot: A luminance unit expressing luminous intensity per square foot of surface, representing brightness in imperial area terms.
Apostilb: A historical luminance unit equal to one divided by pi candela per square meter, used in older photometric and cinematography contexts.
Luminance: The measure of luminous intensity emitted or reflected from a surface per unit area in a specified direction.

Quick Knowledge Check

Which area unit does candela per square foot use?

Square meter

Square foot

Square inch

What is the apostilb mainly associated with?

Contemporary SI units

Historical photometric measurements

Metric area units

Why is it important to consider unit bases when converting?

Because unit definitions can be identical

Because they use different area measurements

Because conversion formulas never change

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