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Definitions (289)

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visual performance


The quantitative assessment of the performance of a visual task, taking into consideration speed and accuracy.
Source: lrc.rpi.edu

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instant start


A method of starting fluorescent lamps in which the voltage that is applied across the electrodes to strike the electric arc is up to twice as high as it is with other starting methods. The higher voltage is necessary because the electrodes are not heated prior to starting. This method starts the lamps without flashing. It is more energy efficient [..]
Source: lrc.rpi.edu

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rapid start


A method of starting fluorescent lamps in which the electrodes are heated prior to starting, using a starter that is an integral part of the ballast. Heating the electrodes before starting the lamps reduces the voltage required to strike the electric arc between the electrodes. A rapid-start system starts smoothly, without flashing.
Source: lrc.rpi.edu

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a-lamp


The incandescent lamp most commonly used in North American households. The "A" designation refers to the lamp's bulbous shape.
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active power


the system input power (in watts) for a lamp-ballast combination.
Source: lrc.rpi.edu

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amalgam


An alloy of mercury with other metals. Some CFLs use a mercury amalgam rather than standard mercury. An amalgam keeps mercury pressure in the discharge near its optimal value as lamp temperature changes. Amalgam lamps can produce more than 90 percent of maximum light output over a wide temperature range, but they can take longer to reach their full [..]
Source: lrc.rpi.edu

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ambient temperature


The temperature of the surrounding air that comes into contact with the lamp and ballast. Ambient temperature affects the light output and active power of fluorescent lamp/ballast systems. Each fluorescent lamp-ballast system has an optimum ambient temperature at which it produces maximum light output. Higher or lower temperatures reduce light outp [..]
Source: lrc.rpi.edu

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amplitude


The maximum absolute value attained by a periodic wave.
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ansi code


American National Standards Institute (ANSI) code that indicates the electrical operating designation of the lamp, which must match that of the ballast.
Source: lrc.rpi.edu

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aperture


The diameter in the opening of a downlight, in inches (in.). Sometimes manufacturers will round up to the next whole-inch increment.
Source: lrc.rpi.edu


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