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Can a CFL be used in a fixture that requires a horizontal position?

Energy Star qualified CFLs can be used both horizontally and vertically. Although the operating position of a CFL can affact how well the lamp performs and the lumen output, the difference is generally so small that it is unnoticable.

ENERGY STAR qualified CFLs are tested in both the "base up" and "base down" positions--the two most extreme positions within the range of possible installation options. If there is greater than five percent difference between the "base up" and "base down" positions, the manufacturer is required to indicate that on the packaging, according to rules from the Federal Trade Commission. Look for a statement on the packaging such as "For use in base-up position only."

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