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The First Recorded Effects
A radio engineer named H J Round who was working for Marconi performed some experiments using crystal detectors.The early detectors were made by using crystals call as semiconductors. -
Experiments
Rubin Braunstein reported that some simple diodes emit infrared light when connected to a current. -
Yellow LED bulb
M. George Craford has invented the first yellow LED and a brighter red LED and Thomas P. Pearsall developed high brightness light-emitting diode. -
Cost Expensive
At first Light-emitting diodes were very expensive, some US$200 per piece. Because of that, they were used as indicators only in highly professional laboratory equipment. -
Todays LED lights
Nowadays LED's are used in almost every place whether in the home or any commercial place. Electricians King of Prussia PA from
D & D Electric Enterprises, Inc. has a knowledge of efficient and budget friendly LED's that are useful for decorating home.