Illumination engineering for energy efficient luminous environments /
Helms, Ronald N.
Illumination engineering for energy efficient luminous environments / Ronald N. Helms. - Englewood Cliffs, N.J. : Prentice-Hall, c1980. - xiii, 322 p. : ill.
0134508092
Electric lighting.
Lighting.
Electric power--Conservation
Illumination engineering for energy efficient luminous environments / Ronald N. Helms. - Englewood Cliffs, N.J. : Prentice-Hall, c1980. - xiii, 322 p. : ill.
0134508092
Electric lighting.
Lighting.
Electric power--Conservation