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This was the first successful screw-in replacement for an incandescent lamp, using new rare earth aluminum lattice phosphors to solve the problem of lumen depreciation that would normally occur quickly in such a thin tube; however, it was not widely adopted, because of its large size, weight (over half a kilogram), pronounced 50 Hz flicker and 3-minute warm up time. It was based on the SL1000 prototype from 1976. In 1985, Osram started selling its model Dulux EL, which was the first CFL to include an electronic

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