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5. Whenever a ballast is designed for a lamp which falls between two values indicated in the above Table, the maximum input power of the ballast-lamp circuit shall be calculated by linear interpolation between the two values of maximum power for the two closest lamps indicated in the Table.
For example if a ballast in lamp category 1 is rated for a 48W lamp at 50Hz, the maximum input power of the ballast-lamp circuit shall be calaculated as follows—
(a)in the period before 21st November 2005—
(b)in the period beginning with that date—
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