The Economics of Projector Lamps for Advertising Purposes

E. W. Beggs

Although the trend in projection lamp development has been toward high-intensity, short-life lamps, the need for a lamp that can be operated for long periods of time, such as in advertising projectors, has arisen. The design and operating characteristics of such a lamp are described, together with the influence of airway beacon practice, the problem of existing projectors, projector lens limitations, and the effect of voltage change.

Print ISSN
Published
1934-02
Content type
Original Research
DOI
10.5594/J07461