The advance in Artificial lighting
with LED invention in 1962 only for indication but commercially marketed
in 1994 for illumination is overshadowed by the various lamps and lanterns
of kerosene from 1866 Cupping Lamp by Arnold
&Sons to Aladdin's mantle lamps, wick lamps, Petromax pressure
lamps by Aida, to LNG gas lamps, battery powered lamps and now Solar
LED lamps. 1860 Unit of illumination Candlepower (cp) latter Candela
is self explained by descending order of lighting rack.