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

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(E)Optics - E+55: Propagation of Light

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.
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E+55+5
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E+55+0 Inverse square law: Light bulb in wire frame.
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E+55+10 Image formed by a pinhole using three light bulbs in a box.