Can anyone answer this question

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Joined: Sat Oct 27, 2012 9:45 pm

Can anyone answer this question

Postby lakshmitadepalli » Sat Nov 17, 2012 7:00 am

A playing field 250ft by 400ft is to have an average illumination at night of 30ft. How many 4000cd lamps are needed if reflectors are used that enable 40 percent of their luminous flux to reach the field?

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