US Department of Energy
U.s. Department of Energy: Energy 101: Lumens
A video exploring lumens and how it relates to brightness of lightbulbs. [1:43]
PBS
Pbs Learning Media: Light Sources
Explore natural and human made light sources in the environment in this live-action video [1:46] produced by WGBH. The video can help children observe and identify light sources and describe objects that are visible in the light's path....