What is the significance of a 5.0 mW Point Light Source?

AI Thread Summary
A 5.0 mW point light source refers to its power output, indicating it emits energy at a rate of 5 joules per second. This measurement is crucial for understanding the intensity and effectiveness of the light source. The discussion clarifies that 5.0 mW should not be confused with energy, as it specifically denotes power. Additionally, while there is mention of milliJanskys in astronomy, this unit is not typically applicable to visible light. Understanding the distinction between energy and power is essential for accurate interpretation of light source specifications.
pardesi
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what do we mean when we say a point light source is 5.0 mW
 
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That is an energy - so not very useful, unless it means 5.0mJ/s ie 5milliWatts.

In astronomy it could be a typo for mJy = milli Jansky bit this isn't commonly used for visible light
 
Last edited:
sorry that was watt.
 
It's not energy, it's power. It means the light source is giving out energy at the rate of 5 J/s.
 

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