how to find the ballast lost from the actual wattage? for
example i am going to buy decorative type 2x36watts
fluorescent light fitting for this lamp how to find the
ballast lost? is there any formula?

Answers were Sorted based on User's Feedback

how to find the ballast lost from the actual wattage? for example i am going to buy decorative type..

If you are buying a fixture with an electronic ballast, the
losses are close to zero.

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how to find the ballast lost from the actual wattage? for example i am going to buy decorative type..

Equal to I^2xR ( resistance of ballast )

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