San Francisco : Architect and Engineer, Inc · leaf 348
er dielec-tric and phosphor control. An indication of lightoutput variation with temperature is shown inFigure 2. No rating on life has thus far been establishedbut it is expected to be measured in years. Unlessbreakdown occurs, prevented largely by adequatedesign and evident only by minute black… … LUMINOUS CEILING: Vs in. thick and 6 ft. wide, con-sisting of squares. Has brightness of 2V2 ft. lamberts.Small, inexpensive transformer brings house currentto 50 volts and entire panel uses less current than75-watt incandescent bulb. years. Moisture, of course, tends to acceleratechemical…
Architecture · Building
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