He-Ne laser compared to non-coherent red light bulb.

A Helium-Neon laser and a red light bulb (tungsten filament) are set out for display, presumably when the discussion is about coherent and incoherent light. Both the laser and bulb can be turned on. He-Ne laser compared to non-coherent red light bulb.
UCB Index: 
E+55+5
Demo Diagram: 

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