Light source

1. Nov 14, 2007

pardesi

what do we mean when we say a point light source is $$5.0 mW$$

Last edited: Nov 14, 2007
2. Nov 14, 2007

mgb_phys

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: Nov 15, 2007
3. Nov 14, 2007

pardesi

sorry that was watt.

4. Nov 15, 2007

Shooting Star

It's not energy, it's power. It means the light source is giving out energy at the rate of 5 J/s.