One lux is equal to one lumen per square metre: 1 lx = 1 lm/m2 = 1 cd•sr•m–2. Illuminance Example Illuminance Example 10−4 lux Total starlight, overcast sky[2] 0.002 lux Moonless clear night sky with airglow[2] 0.01 lux Quarter moon 0.27 lux Full moon on a clear night[2][3] 1 lux Full moon overhead at tropical [...]
Posts from ‘February, 2011’
Feb 13
14th annual Great Backyard Bird Count
Get ready to have some fun, count some birds and make a difference, because the 14th annual Great Backyard Bird Count (GBBC) takes place February 18 through February 21. Anyone can participate. Simply watch and count birds in your yard, a nearby park, or maybe at a school. Then report what you saw by entering [...]