Helms, Ronald N. <br/><br/>
Illumination Engineering for Energy Efficient Luminous Environments / 
R.N. Helms. 
 - Englewood Cliffs, N.J. :  Prentice-Hall, Inc.,  1980. 
 - 322 p. :  fig., tables. 
<br/><br/>Includes Bibliographies and Index. 
<br/><br/><label>ISBN: </label>0-13-450809-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Illumination Engineering