Watt per Square Centimeter (at 555 nm) to Phot Conversion
Convert between Watt per Square Centimeter (at 555 nm) and Phot quickly and accurately.
How to Convert Watt per Square Centimeter (at 555 nm) to Phot
Conversion Formula
Example
Convert 15 W/cm² (at 555 nm) to ph:
Unit Information
Learn about the illumination units you're converting between
Watt per Square Centimeter (at 555 nm)
W/cm² (at 555 nm)
Definition
The Watt per Square Centimeter (at 555 nm) is a unit of spectral irradiance that can be converted to illuminance at the peak sensitivity wavelength of the human eye. It represents the radiant power per unit area at 555 nm, weighted by the luminous efficacy of radiation.
History/Origin
Developed for converting between radiometric and photometric quantities at the peak sensitivity wavelength of human vision. It provides a bridge between physical light measurements and perceived brightness, using the luminous efficacy of 683 lumens per watt at 555 nm.
Current Use
Used in optical engineering, laser technology, and display characterization where the relationship between radiant power and perceived brightness is important. It allows for precise conversion from physical measurements to photometric quantities for monochromatic light sources.
Multiplier
6830000
Offset
0
Phot
ph
Definition
The Phot is a CGS unit of illuminance equal to 10,000 lux, representing one lumen per square centimeter. It is a larger unit used for measuring very high levels of illumination, particularly in scientific and technical applications where high light intensities are common.
History/Origin
Developed as part of the CGS system of units, where the phot provided a convenient way to express high illumination values. It was widely used in scientific literature and technical applications before the adoption of SI units became standard practice.
Current Use
Primarily found in older scientific literature and specialized technical applications. It provides a practical scale for measuring very bright light sources and is still occasionally referenced in photometric research and historical technical documents.
Multiplier
10000
Offset
0
Watt per Square Centimeter (at 555 nm) to Phot Conversion Table
| Watt per Square Centimeter (at 555 nm) [W/cm² (at 555 nm)] | Phot [ph] |
|---|---|
| 1 W/cm² (at 555 nm) | 683 ph |
| 10 W/cm² (at 555 nm) | 6830 ph |
| 25 W/cm² (at 555 nm) | 17075 ph |
| 50 W/cm² (at 555 nm) | 34150 ph |
| 100 W/cm² (at 555 nm) | 68300 ph |
| 0 W/cm² (at 555 nm) | 0E+0 ph |
| -10 W/cm² (at 555 nm) | -6830 ph |
| -40 W/cm² (at 555 nm) | -27320 ph |
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