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Rich writes –

What you are seeing is a capture of a lightbulb in the process of burning out. To create the shot, my friend Harley and I removed the glass enclosure of a standard household lightbulb (while leaving the innards intact) and powered it up in a pitch black room. The result was an immediate burn-out, which we were all too ready to photograph. The red hue on the smoke was added in post-processing.

LeggNet’s Digital Capture: Spontaneous Combustion – Link.