when cfl bulbs are bigger than the incandescent it replaces, sometimes the shade no longer fits the lamp « »

Shady Decisions

A. A new style of CFL addresses the clip-on shade dilemma, as well as fixtures where the bulb is visible, by putting the spiral inside a round glass globe. Most companies, including Philips, Sylvania, and General Electric, sell these under the names "bulb-shaped," "covered," or "capsule." But the term that matters, and what should be on the packaging, is A19, the shape for standard incandescents. An A21 label signifies the same shape but a slightly larger bulb.
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