Man's physical universe

xanabras

ILLUMINATION 447

12. Why are table lamps and floor lamps used more widely than flush-type

lights, cove-lighting, and lens-lighting?

13. If one 100-watt light bulb provides adequate light intensity for reading in a

floor lamp placed so that the light bulb is three feet from a book, how many

100-watt light bulbs would be required in a flush-type ceiling fixture, eight

feet from the book, provided that the same types of reflectors were used in

each case and no difi^using globes or plates were placed on the lamps?

14. Why should one select different types of glass blocks for diff^erent exposures?

15. Why are electric-light bulbs frosted?

16. What changes would inexpensive fluorescent lamps or zeon lights probably

make possible in the illumination of houses?

17. Why is indirect lighting more costly than direct lighting?

18. Compare direct, indirect, and semi-indirect lighting with outdoor natural

lighting.

19. Would you prefer to read out-of-doors in direct sunlight or diff^used sunlight?

Why?

20. Why is the glare out-of-doors worse on a cloudy day than on a clear day?

What application of this fact can you make to indoor illumination?

21. Why is the light transmitted through a window with a north exposure preferred

for drawing and artwork? What type of artificial illumination most

closely resembles the light from a north window?

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