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How to Convert from Watt/sq. cm (at 555 nm) to Nox?
Learn how to convert radiometric irradiance measured in watt per square centimeter at 555 nm to the specialized low-light illuminance unit nox. Understand its usage in lighting design and vision science.
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Watt/sq. cm (at 555 nm) to Nox Conversion Table
| Watt/sq. cm (at 555 nm) | Nox |
|---|
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| Watt/sq. cm (at 555 nm) | Nox |
|---|
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What Is This Tool?
This converter transforms values from watt/sq. cm (at 555 nm), a radiometric unit specialized for monochromatic green light irradiance, into nox, a unit used to quantify extremely low illuminance levels. It is ideal for applications requiring conversion between radiant power at the photopic peak wavelength and very faint light conditions.
How to Use This Tool?
- Enter the irradiance value measured in watt/sq. cm at 555 nm
- Select the from-unit as watt/sq. cm (at 555 nm)
- Choose the to-unit as nox to get very low light level measurements
- Submit the input to obtain the converted value in nox
- Use results to interpret monochromatic irradiance in terms of low-light illuminance
Key Features
- Converts specific monochromatic irradiance at 555 nm to photometric illuminance units
- Uses the luminous efficacy factor of 683 lm/W for the conversion
- Outputs results in nox, representing very low light illumination
- Supports applications like photometric calibration, lighting design, and vision research
- Accurately translates radiometric power at the peak sensitivity wavelength into illuminance
Examples
- 0.5 watt/sq. cm (at 555 nm) converts to 3,415,000,000 nox
- 0.001 watt/sq. cm (at 555 nm) converts to 6,830,000 nox
Common Use Cases
- Calibrating light sources and photometers converting radiant irradiance to illuminance for lighting standards
- Quantifying stimulus levels at 555 nm in vision science and psychophysics experiments
- Defining exposure limits for green optical sources in photobiological assessments
- Describing natural night illumination like moonlight for environmental and astronomical studies
- Specifying minimal background lighting in dark-sky planning and exterior lighting designs
- Characterizing low-light test conditions for sensitive optical sensors or imaging devices
Tips & Best Practices
- Ensure the irradiance input is monochromatic at exactly 555 nm for accurate conversion
- Understand that nox measures very low illuminance, suitable for near-dark conditions
- Use the tool primarily when comparing green light irradiance with faint illumination levels
- Remember this conversion is limited to monochromatic light and may not apply to broad spectra
- Familiarize yourself with the unit nox in specialized low-light or night illumination contexts
Limitations
- Conversion only applies to monochromatic irradiance measured at 555 nm
- Uses a fixed luminous efficacy value of 683 lm/W, not adaptable for other wavelengths
- Nox is a niche unit uncommon outside specialized low-light or environmental lighting applications
- Does not account for complex spectral distributions beyond the peak photopic wavelength
Frequently Asked Questions
- What does watt/sq. cm (at 555 nm) measure?
- It measures radiant power incident per unit area at the specific wavelength 555 nm, corresponding to the peak of the photopic luminous-efficiency function.
- Why is nox used instead of lux for low light levels?
- Nox is a specialized unit equal to 1 millilux, designed to describe very low illuminance such as natural night light, making it more suitable for near-dark conditions.
- Can this conversion be used for broad-spectrum light sources?
- No, the conversion is valid only for monochromatic irradiance at 555 nm and does not apply to broader spectral distributions.
Key Terminology
- watt/sq. cm (at 555 nm)
- A radiometric irradiance unit measuring radiant power per area at 555 nm, the peak photopic wavelength.
- nox
- A specialized illuminance unit equal to 1 millilux, used for describing very low light levels such as night-time illumination.
- luminous efficacy
- A factor (683 lm/W) used to convert radiant power at 555 nm into photometric illuminance.