The Electromagnetic Spectrum
The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The "electromagnetic spectrum" of an object has a different meaning, and is instead the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.
source:
N.p., 2015. Print.
source:
N.p., 2015. Print.
The History of the light bulb
1803 The first Arc Lamp
1835 A light bulb was created
1841 First attempt lighting the streets with an electric street lamps
1856 The Geissler Tube
1879 Thomas Edison's designs
1893 Nikola Tesla - creating wireless electrical lamp
1910 Neon lighting
1926 Fluorescent lighting
1939 The World Fair
1981 Energy saving lighting
1991 Longer lasting bulbs
1995 The LED light
2000 LED's (generating better lighting)
2008 The L Prize Competition (a challenge for energy efficient companies)
2012 Energy Saving light sources
1835 A light bulb was created
1841 First attempt lighting the streets with an electric street lamps
1856 The Geissler Tube
1879 Thomas Edison's designs
1893 Nikola Tesla - creating wireless electrical lamp
1910 Neon lighting
1926 Fluorescent lighting
1939 The World Fair
1981 Energy saving lighting
1991 Longer lasting bulbs
1995 The LED light
2000 LED's (generating better lighting)
2008 The L Prize Competition (a challenge for energy efficient companies)
2012 Energy Saving light sources