ballast.

Volume was an issue in CFL development, since the fluorescent lamps had to fit in the same volume as comparable incandescent lamps. This required the development of new, high-efficacy phosphors that could withstand more power per unit area than the phosphors used in older, larger fluorescent tubes.

Mainstream success

In 1995, helical CFLs, manufactured in China by Shanghai Xiangshan, became commercially available. They were first proposed by General Electric, who saw difficulties bending glass tubes into spirals

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