Helms, Ronald N. <br/><br/>
Illumination engineering for energy efficient luminous environments 
Ronald N. Helms. 
 - Englewood Cliffs, N. 
 - xiii, 322 p. :ill. ;25 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0134508092 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric lighting.<br/>Lighting.<br/>Electric power -- Conservation.--TK
<br/><br/><label>LC Class. No.: </label>TK4175.H45