| The first rechargeable flashlight was introduced in 1967. Sir Humphrey Davy of England invented the first electric carbon arc lamp in 1801. The light created by a glow stick is the result of a chemical reaction called Chemiluminescence. LED bulbs can last for up to 100,000 hours of use, which is almost 11 years! The word lamp is derived from the Greek word lampas, meaning torch. |
|
|
|
