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Schneider, Homer J. (ed.) / The Wisconsin engineer
Volume 46, Number 4 (January 1942)

Hornberg, Kenneth; Lindsley, Warren
Observations on fluorescent lighting,   pp. 10-11


Page 10


Observations on Fluorescent Lighting
        At the National Guardian Life Insurance Building,
                                 Madison, Wisconsin
        4~ Kewneh >b oaby4e', e'4.2 and V/avenz /2iaddlei, e'4.2
PARTLY because of its efficiency and architectural
     possibilities, and also because it is, to a large degree,
     a new commercial application of a rather involved
energy transformation process mysterious to the lay pub-
lic, fluorescent lighting has become an increasingly popu-
lar form of artificial illumination since its commercial
introduction in 1938. In fact, fluorescent lights have been
instrumental in raising illumination values from the 5
foot-candle average of 15 years ago to the 50 foot-candles
or more of today in many modern installations.
  Such a high level of illumination is featured by the
fluorescent installation in Madison's new National Guard-
ian Life Insurance Building. Completed on June 1, 1941,
and covering 7,480 square feet of shore frontage on Lake
Mendota, this three-story, fireproof building of Bedford
stone laid against concrete is completely air-conditioned
(except for complete humidity control) by means of pin-
hole ventilation through the ceiling. Law, Law and Potter
were the architects, with Mr. Paul Nystrom of their staff
responsible for the lighting. Electric contractor was Mr.
0. T. Havey.
  Practically shadowless illumination is accomplished by
means of fluorescent
tubes recessed in con-
tinuous ceiling trof-
fers  equipped  with
controlling  I e n s e s
mounted flush with
the ceiling. This type
of lighting is main-
tained throughout the
building with the ex-
ception of the main
vestibule in which in-
candescent cove light-
ing is used for deco-
rative purposes, and
in a few minor rooms
such as store rooms
and the garage. Alto-
gether there are 1918
linear feet of troffers,
or over a quarter of
  -1 mil nficni t
The    ,, r o f f e r s wereTroffer arrangemet
The t r o f f e r s were
manufactured by the Architectural Lighting Company to
fit in with the acoustic ceiling sections. The same Libbey-
Owens-Ford Flutex lens was used with all single and
double tube troffers. Proper location of the troffers plays
an important part in obtaining balanced illumination.
  This system required the following troffer units prop-
erly located to produce the desired uniformity of illumi-
nation. Average separation of troffers was about 5 feet.
Additional pertinent data on the lamp efficiency and
losses are included. 35000 white lamps were used.
Quantity Unit  Length
172 Single tube  48"
304 Double tube  48"
  11 Double tube  24"
Tube Size
40 watt
40 watt
20 watt
            Total Watts*'
  Tube Lumens* At 120 At 125
110 v. 120 v. 125 v. Volts Volts
2100 2140 2230 50  54
2100 2140 2230 100 107
860 877  916  30  32
*Taken from data in August 1, 1941, Mazda lamp price schedule.
Lumens output are after 100 hours operation. At 70% of rated life
(rated at 2500 hours) the output has decreased approximately 15%.
*"Based on data in General Electric Co., Nela Park Engineering Depart-
ment, Booklet B. Values are approximate and differ somewhat for various
makes of ballast units.
  The 48 inch double tube units were used in peripheral
parts of the ceiling as shown in Figure 1 to help produce
                                 uniform illumination
it in general office.
        Courtesy of Cantwell Printing Co.
over the entire floor.
The 24 inch units were
used for cove lighting
and in the filing office
to provide the proper
distribution of light.
To further improve
visual  effectiveness,
the walls were finished
with a special Nela-
Park green.
    Construction
      Statistics
  Building costs
amounted to $159,000,
of which $18,329, or
11.5%, was spent on
electrical work, a large
part of which was de-
voted to the fluores-
cent lighting installa-
tion; the total cost of
THE WISCONSIN ENGINEER
Page I 0


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