LD+A is a magazine for professionals involved in the art, science, study, manufacture, teaching, and implementation of lighting. LD+A is designed to enhance and improve the practice of lighting. Every issue of LD+A includes feature articles on design projects, technical articles on the science of illumination, new product developments, industry trends, news of the Illuminating Engineering Society of North America, and vital information about the illuminating profession.

Statements and opinions expressed in articles and editorials in LD+A are the expressions of contributors and do not necessarily represent the policies or opinions of the Illuminating Engineering Society of North America. Advertisements appearing in this publication are the sole responsibility of the advertiser.

LD+A (ISSN 0360-6325) is published monthly in the United States of America by the Illuminating Engineering Society of North America, 120 Wall Street, 17th Floor, New York, NY 10005, (212) 248-5000. Copyright 2007 by the Illuminating Engineering Society of North America. Periodicals postage paid at New York, NY 10005 and additional mailing offices. Nonmember subscriptions $44.00 per year. Additional $15.00 postage for subscriptions outside the United States. Member subscriptions $32.00 (not deductable from annual dues). Additional subscriptions $44.00. Single copies $4.00, except Lighting Equipment & Accessories Directory and Progress Report issues $10.00. Authorization to reproduce articles for internal or personal use by specific clients is granted by IESNA to libraries and other users registered with the Copyright Clearance Center (CCC) Transactional Reporting Service, provided a fee of $2.00 per copy is paid directly to CCC, 21 Congress Street, Salem, MA 01970. IES fee code: 0360-6325/86 $2.00. This consent does not extend to other kinds of copying for purposes such as general distribution, advertising or promotion, creating new collective works, or resale.

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This publication is indexed regularly by Engineering Index, Inc. and Applied Science & Technology Index. LD+A is available on microfilm from University Microfilm, Ann Arbor, MI.

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