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1950-51 Theatre Catalog, 9th Edition, Page 24 (4)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 24
Page 24

1950-51 Theatre Catalog, 9th Edition, Page 24

Prismatic type glass. Three elfects:

(1) Parallel lumiline lamps arranged vertically behind glass. (2) Spot pattern of small filament lamps behind glass.

Uniform diffusing white plastic, lighted from behind in either of two ways: (a) smooth lighting with pattern of lamps uniiormly spaced. or (b) lighting graded trom bottom to top as shown. with-lamps lighted at base.

(3) Indirect lighting of reflecting surface with T-5. fluorescent

lamps in horizontal bands.

6-watt S-6 clear lamps all on one circuit with dimmer control for selection ot desired brightness.

15 MM fluorescent pink white tubing.

Ribbed Clear glass.

Shadow produced by lSO-watt PAR 38.

Edge lighting of clear plastic with sandblasted edge. Lamps are: T-5 F.

Pattern cut in transparent plastic. Sheet is edge lighted.

Smooth surface. lncised lines for texture.

Concealed lighting to illustrate effect on two types of surtaces.

Pattern from silhouette lighting.

Pattern ot ' highlights and shadows. Fluorescent lamp in element above.

Flashed opal glass over T-5 F lamps.

lighted edge. Many unexploited variations lie in the direction of edge lighting in color (through clear material), combined with colored and textured surfaces behind the edge-lighted panel.

The usual problem is getting a sufficient amount of light into the edge of the sheet. Extensive studies show best results when the edge is flat and polished with the light source close to the edge. This distance is limited by the heat of

filament lamps, but fluorescent lamps can be located within 1/5" of the edge. Sheets 1/4" thick are better than 1/3", and 1/2" thickness is even better. Slimline lamps %" in diameter, operated at 0.200 or 0.300 amperes, are recommended. A white cavity around the lamp will increase brightness approximately 10%.

Black LightBlack light is steadily increasing in popularity for auditorium murals, and

MERCURY BLACK LIGHT LAMPS have been used here to energize the parts of the forms treated with fluorescent materials, such as map pin heads and wire grid at left, the checkerboard pattern and perforated panel. Edge lighting, tubing and background lamps supplement black light.

interest is developing in its use for posters. Unexploited possibilities include curtain treatments and large area ceiling patterns in the foyer and balconies.

As far as the amount of radiation is concerned, approximately one watt per square. foot of area lighted may be used as a guide for designing installations to be used as running lights in the auditorium, assuming conventional placement of the EH-4 (lOO-watt fiood) mercury lamps with light-absorbing tilters. When the AH-5 (250-watt) mercury lamps are used, about 2/3 watt per square foot is suggested. The fluorescent lamps require large areas of filter, and ttpotblue" glass is often used. This transmits somewhat more black light than the Filters ordinarily used with mercury lamps, but also transmits more visible energy. Therefore, it may be objectionable in the auditorium where light finisth arc used. Approximately '5 watt per square foot is suggested.

in the foyer and lobby. much higher amounts of radiation are desirable, so 10 watts or more per square foot arc rccommcmled.


Lighting tools are available for all of these techniques. The sizes, types and colors of fluorescent and filament lamps on the market today, and the equipment by which their light can be controlled, oifer the theatre designer almost unlimited freedom in putting to work whatevvr ctl'ccts his imagination may bring forth.

1950-51 Theatre Catalog, 9th Edition, Page 24