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How to Convert from Blondel to Lumen/sq. meter/steradian?
Easily convert luminance measurements from the historical blondel unit to the modern lumen per square meter per steradian unit using our online converter tool. Understand the relevance and applications of this photometric conversion.
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Blondel to Lumen/sq. meter/steradian Conversion Table
| Blondel | Lumen/sq. meter/steradian |
|---|
Custom Unit Conversion Table Generator – Instant Printable Conversion Tables
Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.
Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.
Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.
| Blondel | Lumen/sq. meter/steradian |
|---|
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What Is This Tool?
This converter facilitates transforming luminance values from the obsolete blondel unit, once common in early photometry, into the current standard unit lumen per square meter per steradian (lm·m⁻²·sr⁻¹), aligned with SI units and used across modern lighting and display technologies.
How to Use This Tool?
- Enter the luminance value measured in blondels.
- Select 'blondel' as the original unit and 'lumen/sq. meter/steradian' as the target unit.
- Click the convert button to get the equivalent luminance in lumen/sq. meter/steradian.
- Use the result for comparison or analysis with contemporary photometric standards.
Key Features
- Converts luminance from blondel to lumen/sq. meter/steradian accurately.
- Supports analysis of historical photometric data with modern units.
- Ideal for lighting design, display brightness specification, and instrument calibration.
- Browser-based and easy to use with no installation required.
Examples
- 2 blondel converts to 0.6366197724 lumen/sq. meter/steradian.
- 5 blondel converts to 1.591549431 lumen/sq. meter/steradian.
Common Use Cases
- Analyzing and updating historical photometry and lighting engineering data.
- Specifying and comparing display brightness on monitors and TVs.
- Designing lighting and signage to optimize visible brightness and reduce glare.
- Calibrating optical instruments and evaluating camera exposure settings.
Tips & Best Practices
- Verify historical measurement conditions when converting legacy data for accuracy.
- Use this conversion to align older luminance reports with modern SI units.
- Apply conversion results to improve the relevance of historical lighting data in current projects.
Limitations
- The blondel is outdated and seldom used in modern measurements.
- Conversion results depend on proper interpretation of original measurement contexts.
- Most current standards use lumen/sq. meter/steradian or candela per square meter instead of blondel.
Frequently Asked Questions
- What is a blondel in photometry?
- The blondel is an old unit of luminance named after André Blondel, used in early 20th-century measurements before the adoption of SI units.
- Why convert blondel to lumen/sq. meter/steradian?
- Conversion is useful to translate historical luminance data into current SI units for comparison and practical use in modern lighting and display technologies.
- Is the blondel unit still used today?
- No, it is largely obsolete and mostly relevant for analyzing legacy photometric records.
Key Terminology
- Blondel
- An obsolete unit of luminance representing luminous intensity per unit area, historically used in early photometry.
- Lumen per square meter per steradian
- A modern SI unit of luminance quantifying luminous intensity emitted or reflected per unit area and solid angle.
- Luminance
- The measure of luminous intensity per projected area in a specified direction, describing surface brightness.