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How to Convert from Watt/sq. cm (at 555 nm) to Lux [lx]
Learn how to convert radiant power per unit area at 555 nm wavelength measured in watt/sq. cm to illuminance in lux, an essential process for lighting design, calibration, and photobiological safety.
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Watt/sq. cm (at 555 nm) to Lux [lx] Conversion Table
| Watt/sq. cm (at 555 nm) | Lux [lx] |
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| Watt/sq. cm (at 555 nm) | Lux [lx] |
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What Is This Tool?
This converter transforms measurements of radiant power per square centimeter at the 555 nm wavelength into lux, the unit that expresses illuminance based on human visual response. It's designed to help translate radiometric data into photometric values relevant for brightness perception.
How to Use This Tool?
- Enter the radiant power value in watt/sq. cm measured at 555 nm.
- Select the unit watt/sq. cm (at 555 nm) as your starting measurement.
- Choose lux [lx] as the unit to convert to.
- Execute the conversion to obtain illuminance in lux, reflecting human photopic perception.
Key Features
- Converts watt/sq. cm (at 555 nm) to lux using the precise luminous efficacy factor of 683 lm/W.
- Supports calibration and testing of light sources and photometers for accurate illuminance measurement.
- Helps quantify monochromatic light stimuli at the photopic sensitivity peak in vision science and photobiology.
- Applies specifically to monochromatic irradiance at 555 nm, aligning with human daylight vision standards.
Examples
- 0.0001 watt/sq. cm (at 555 nm) converts to 683 lux [lx].
- 0.002 watt/sq. cm (at 555 nm) converts to 13,660 lux [lx].
Common Use Cases
- Calibrating light sources and photometers by converting radiometric irradiance to photometric illuminance.
- Setting exposure levels and assessing safety limits for green optical sources in photobiological tests.
- Conducting vision science research that targets the 555 nm photopic peak.
- Applying illuminance values in lighting design and standards for indoor and outdoor environments.
Tips & Best Practices
- Ensure measurements are taken precisely at 555 nm wavelength to use the conversion reliably.
- Use calibrated instruments capable of isolating monochromatic irradiance to maintain accuracy.
- Apply this conversion only for monochromatic light at 555 nm, not for broadband sources.
- Understand that the luminous efficacy factor of 683 lm/W is specific to the 555 nm wavelength.
Limitations
- This conversion is valid only for monochromatic irradiance measured exactly at 555 nm.
- It assumes the luminous efficacy factor of 683 lm/W, which does not apply to other wavelengths or broadband light.
- Accuracy depends on the precision and calibration of instruments isolating 555 nm irradiance.
Frequently Asked Questions
- Why is 555 nm wavelength important for this conversion?
- 555 nm corresponds to the peak of the photopic luminous-efficiency function, representing peak human eye sensitivity under daylight conditions, which makes it suitable for converting radiometric to photometric units.
- Can I use this conversion for broad-spectrum light sources?
- No, this conversion applies only to monochromatic light at 555 nm. It is not accurate for broad-spectrum or other wavelength light sources.
- What is the luminous efficacy used in this conversion?
- The converter uses a luminous efficacy of 683 lumens per watt, which is the standard value at 555 nm for converting radiant power to perceived luminous flux.
Key Terminology
- Watt/sq. cm (at 555 nm)
- A radiometric unit measuring radiant power per unit area specifically at the 555 nm wavelength.
- Lux [lx]
- The SI derived unit of illuminance quantifying luminous flux per square meter weighted by the photopic visual response.
- Luminous Efficacy
- A factor (683 lm/W at 555 nm) used to convert radiometric power to photometric luminous flux reflecting human vision.