Hewitt Drew-It! PHYSICS Screencasts
Light Emission

115. Atomic Excitation
Excitation explained with examples.

116. Atomic Spectra
The spectroscopes and emission and absorption spectra explained

117. Emission of Light
Incandescence, fluorescence, and phosphorescence explained

118. Lamps
Incandescent lamps, fluorescent lamps, CFLs and LEDs explained

119. Laser Light
Explanation of the helium-neon laser.