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A rule of conduct or procedure established by custom, agreement, or authority. The body of rules and principles governing the affairs of a community and enforced by a political authority; a legal system: international law. The condition of social order and justice created by adherence to such a system: a breakdown of law and civilized behavior. A set of rules or principles dealing with a specific area of a legal system: tax law; criminal law. A piece of enacted legislation. What is Law?

Timeline of lighting technology

   * circa 3000 BC Candles are invented.
   * ??? BC oil lamps
   * 1840 first kerosene lamps (oil lamps that burn fuel from petroleum)
   * 1853 Ignacy Lukasiewicz invents petrol lamp
   * 1792 William Murdoch lights his house and office by means of gas.
   * c. 1802 Humphry Davy demonstrates arc-lighting.
   * 1815 Humphry Davy invents the miner's safety lamp.
   * 1835 James Bowman Lindsay demonstrates a light bulb based electric
     lighting system to the citizens of Dundee.
   * 1841 Arc-lighting used as experimental public lighting in Paris
   * 1867 A. E. Becquerel demostrates the first fluorescent lamp
   * 1875 Henry Woodward patents the electric light bulb.
   * 1876 Paul Jablochkoff invents the Jablochkoff candle, the first
     practical carbon arc lamp, for public street lighting in Paris.
   * 1879 Thomas Edison and Joseph Wilson Swan patent the carbon-thread
     incandescent lamp.
   * c. 1885 Incandescent Mantle invented, revolutionises Gas lighting.
   * c. 1893 Nikola Tesla uses cordless low pressure gas discharge lamps,
     powered by a high frequency electric field, to light his laboratory.
   * 1903 Peter Cooper Hewitt demonstrates the mercury-vapour lamp.
   * 1911 Georges Claude develops the neon lamp.
   * 1962 Nick Holonyak Jr. developed the first practical visible-spectrum
     LED
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