"If I look at lenses under the light of so-called energy saving bulbs
(compact neon [sic] lights for screwing in normal bulb threads), I can
see a coloured interference pattern (concentric circles). It seems to
appear at cemented groups."
This pattern occurs because these fluorescent lamps do not have a
continuous spectrum. The energy is concentrated in four or five bands *,
so the interference effects are similarly grouped in discrete rings.
* You can see this by looking at the bulb with a prism or diffraction
grating. A CD makes a great reflection grating.
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