What is the article about?
LEDs
What does this stand for?
Light-emitting diodes
When were they first created?
1927
By whom?
Oleg Losev
What was his occupation?
inventor
What became of his discovery?
was distributed in Soviet, German and British scientific journals
Were other scientists responsible in the advancement?
yes
How many?
Three
Can you name one?
Kurt Lehovec
When did they help advance the theory?
1951
How are they applied today?
environmental and task lighting.
any other ways?
yes
What are those?
aviation lighting, automotive headlamps, advertising, general lighting, traffic signals, camera flashes and lighted wallpaper
Are they cheap?
no
Are they hotter than standard bulbs?
yes
While producing the same light?
no
Do they consume more power than standard bulbs?
no
Do they last longer?
yes
Can they be seen on walls?
yes
How do they benefit a photographer?
camera flashes