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2. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   Historians Robert Friedel and Paul Israel list inventors of incandescent lamps prior to Joseph Swan and Thomas Edison of General Electric. [4]: 91–93 They conclude that Edison's version was the first practical implementation, able to outstrip the others because of a combination of four factors: an effective incandescent material; a vacuum higher than other implementations which was achieved ...

3. Thousand Lights Assembly constituency - Wikipedia

   en.wikipedia.org/wiki/Thousand_Lights_Assembly...

   SPA. Elected year. 2021. Thousand Lights is a constituency of the legislative assembly of the Indian state of Tamil Nadu. Its State Assembly Constituency number is 20. It forms a part of the Chennai Central Lok Sabha constituency for national elections to the Parliament of India. It is one of the 234 State Legislative Assembly Constituencies in ...

4. Charlie Brown and Franz Stigler incident - Wikipedia

   en.wikipedia.org/wiki/Charlie_Brown_and_Franz...

   The Charlie Brown and Franz Stigler incident occurred on 20 December 1943, when, after a successful bomb run on Bremen, 2nd Lt. Charles "Charlie" Brown 's B-17F Flying Fortress Ye Olde Pub of the United States Army Air Forces (USAAF) was severely damaged by German fighters. Luftwaffe pilot Franz Stigler had the opportunity to shoot down the ...

5. Compact fluorescent lamp - Wikipedia

   en.wikipedia.org/wiki/Compact_fluorescent_lamp

   The tubular-form CFL is one of the most popular types in Europe. A compact fluorescent lamp ( CFL ), also called compact fluorescent light, energy-saving light and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs.

6. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy ...

7. Speed of light - Wikipedia

   en.wikipedia.org/wiki/Speed_of_Light

   In 1629, Isaac Beeckman proposed an experiment in which a person observes the flash of a cannon reflecting off a mirror about one mile (1.6 km) away. In 1638, Galileo Galilei proposed an experiment, with an apparent claim to having performed it some years earlier, to measure the speed of light by observing the delay between uncovering a lantern ...