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The depth to which useful daylight penetrates a side-lit room is roughly

  • A.twice the head height of the window
  • B.half the head height of the window
  • C.five times the head height of the window
  • D.independent of the window height

Answer: A

Raising the window head is therefore worth more than widening the window, and a room deeper than about twice that height needs top lighting or electric light at the back. It is the rule that governs plan depth in a daylit building.

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