Federal Register, Volume 75, Number 226, November 24, 2010, Pages 71519-72652 Page: 71,584
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Federal Register/Vol. 75, No. 226/Wednesday, November 24, 2010/Proposed Rules
TABLE 111.2-BALLAST AND LAMP PAIRINGS-Continued
Reference lamp arc
Nominal Lamp power
Ballast type lamp diameter
wattage and base Low- High-
Ballasts that operate one or two straight-shaped lamps (commonly referred to as 4-foot 28 T5 SO Mini- N/A 27.8
miniature bipin standard output lamps) with miniature bipin bases, a nominal length BP.
between 45 and 48 inches, a rated wattage of 26 W or more, and an input voltage at
or between 120 V and 277 V.
Ballasts that operate one, two, three, or four straight-shaped lamps (commonly referred 54 T5 HO Mini- N/A 53.8
to as 4-foot miniature bipin high output lamps) with miniature bipin bases, a nominal BP.
length between 45 and 48 inches, a rated wattage of 49 W or more, and an input
voltage at or between 120 V and 277 V.
Ballasts that operate one, two, three, or four straight-shaped lamps (commonly referred 32 T8 MBP ........ 30.8 29
to as 4-foot medium bipin lamps) with medium bipin bases, a nominal overall length 34 T12 MBP ...... 32 *29.81
of 48 inches, a rated wattage of 25 W or more, an input voltage at or between 120 V
and 277 V, a power factor of less than 0.90, and that are designed and labeled for
use in residential applications.
Ballasts that operate one, two, three, four, five, or six rapid-start lamps (commonly re- 86 T8 HO RDC N/A 86
ferred to as 8-foot high output lamps) with recessed double contact bases, a nominal 110 T12 HO RDC 106 *100.03
overall length of 96 inches, an input voltage at or between 120 V and 277 V, and that
operate at ambient temperatures of 20 F or less and are used in outdoor signs.
MBP, Mini-BP, RDC, and SP represent medium bipin, miniature bipin, recessed double contact,
* Empirically derived.
and single pin, respectively.
DOE also found that ballasts are
capable of operating fewer than the
maximum number of lamps they are
designed to operate. For example, a
ballast designed to operate four lamps
can also operate two or three lamps.
However, DOE understands that ballasts
are typically paired with the maximum
number of lamps they are designed to
operate. As discussed in the NOPR, DOE
proposes to test fluorescent lamp
ballasts only while operating the
maximum number of lamps for which
they are designed to operate. DOE
believes this proposal both reduces
testing burden and assesses the
performance of the ballast in its primary
and most common configuration.
3. Test Method
Once the lamp-and-ballast system is
connected and attached to the
measurement instrumentation, DOE
proposes that the ballast operate a
fluorescent lamp for a minimum of
fifteen minutes to a maximum of one
hour until stability is reached. DOE
notes that the NEMA Test Procedure
Handout indicated stability should be
determined in accordance with ANSI
C78.375-1997. DOE found the
specifications in this standard to be
unclear. To further specify the
determination of stabilization, DOE
proposes that measurements of lamp arc
voltage, lamp arc current, lamp arc
power be taken every one second during
the stabilization period. Once the
percent difference between the
minimum and maximum values for
voltage, current, and power do not
exceed one percent over a four minute
moving window, the system would be
considered stable. Allowing the lamp
and ballast system to reach its steady
state operating point will provide a
more accurate assessment of ballast
performance in the field. If the system
does not stabilize, a new ballast sample
would be selected and the test would be
After the system has stabilized, DOE
proposes that the measured input
parameters be voltage (RMS 15), current
(RMS), power, and power factor
measured in accordance with ANSI
C82.2-2002. The measured output
parameters would include lamp arc
voltage, current, and power. Lamp arc
current and voltage measurements
would be taken at the specified
locations according to the test setup.
Frequency of the output waveform
delivered to the lamp by the ballast
should also be measured.
As described in Equation 2 below,
ballast luminous efficiency is equal to
total lamp arc power, divided by ballast
input power, multiplied by 100, and
then multiplied by 0.9 for ballasts that
operate lamps at low-frequency.
The symbol (3 is equal to 0.9 for low-
frequency ballasts and is equal to 1.0 for
DOE is also proposing a method of
calculating ballast factor to potentially
be used in the fluorescent lamp ballast
standards rulemaking to assign a ballast
to a particular product class. The
15 Root mean square (RMS) voltage is a statistical
measure of the magnitude of a voltage signal. RMS
method specifies dividing the measured
lamp arc power on the test ballast by the
measured lamp arc power on a reference
ballast. The reference lamp arc power
will be the measured power determined
during reference lamp identification in
accordance with ANSI C78.375-2010,
ANSI C78.81-2010, and ANSI C82.3-
voltage is equal to the square root of the mean of
2002. Reference lamp measured power
can change over time which could
impact the BF calculation. Increasing
the frequency of the reference lamp
measurement could lead to increased
ballast factor calculation accuracy with
slightly increased testing burden. DOE
proposes that the reference lamp arc
all squared instantaneous voltages over one
complete cycle of the voltage signal.
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United States. Office of the Federal Register. Federal Register, Volume 75, Number 226, November 24, 2010, Pages 71519-72652, periodical, November 24, 2010; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc52807/m1/74/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.