3. At what height above the drawing board need to hang

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3. At what height above the drawing board need to hang a light bulb power P = 300 W, that the light board under the lamp was equal to E = 60 lux. The slope of the board is 30 °, and the luminous efficiency of light bulbs is 15 lm / W. Accept that the full luminous flux emitted by an isotropic point source of light, ^ 0 = 4πI.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)

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