Recent developments in LEDs permit them to be used in environmental and task lighting. LEDs have many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved physical robustness, smaller size, and faster switching. Light-emitting diodes are now used in applications as diverse as aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes and lighted wallpaper. As of 2015[update], LEDs powerful enough for room lighting remain somewhat more expensive, and require more precise current and heat management, than compact fluorescent lamp sources of comparable output. 

Electroluminescence as a phenomenon was discovered in 1907 by the British experimenter H. J. Round of Marconi Labs, using a crystal of silicon carbide and a cat's-whisker detector. Soviet inventor Oleg Losev reported creation of the first LED in 1927. His research was distributed in Soviet, German and British scientific journals, but no practical use was made of the discovery for several decades. Kurt Lehovec, Carl Accardo and Edward Jamgochian, explained these first light-emitting diodes in 1951 using an apparatus employing SiC crystals with a current source of battery or pulse generator and with a comparison to a variant, pure, crystal in 1953.
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LEDs
Recent developments in LEDs
Light-emitting diodes
Light-emitting diodes 
1927
Oleg Losev reported creation of the first LED in 1927
Oleg Losev
Oleg Losev reported creation of the first LED in 1927
inventor
Soviet inventor Oleg Losev r
was distributed in Soviet, German and British scientific journals
His research was distributed in Soviet, German and British scientific journals
yes
Kurt Lehovec, Carl Accardo and Edward Jamgochian, explained these first light-emitting diodes in 1951
Three
Kurt Lehovec, Carl Accardo and Edward Jamgochian
Kurt Lehovec
Kurt Lehovec
1951
Lehovec, Carl Accardo and Edward Jamgochian, explained these first light-emitting diodes in 1951
environmental and task lighting.
be used in environmental and task lighting.
yes
Light-emitting diodes are now used in applications as diverse as aviation lighting
aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes and lighted wallpaper
Light-emitting diodes are now used in applications as diverse as aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes and lighted wallpaper
no
LEDs powerful enough for room lighting remain somewhat more expensive
yes
require more precise current and heat management,
no
EDs powerful enough for room lighting remain somewhat more expensive, and require more precise current and heat management, than compact fluorescent lamp sources of comparable output. 
no
LEDs have many advantages over incandescent light sources including lower energy consumption
yes
onger lifetime
yes
 LEDs powerful enough for room lighting 
camera flashes
Light-emitting diodes are now used in applications as diverse as aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes