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Landscape Lighting |
Landscape Lighting Glossary
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Outdoor Lighting Safety |
Lighting Efficiency vs. Cost |
Lighting Activation
What is AC current and how does it differ from
DC current?
AC Current (Alternating Current) is electrical current in which the
direction is reversed at regular intervals or cycles; in the U.S.
the standard is 120 reversals or 60 cycles per second. DC Current
(Direct Current) is a type of electrical current and distribution by
which electricity flows in one direction the conductor. Battery
operated systems are typical DC applications.
What is a color rendering index or CRI?
This is an index from 0-100 measuring a light source’s ability to
render color accurately. Sodium lamps can have a CRI as low as 22,
while tungsten halogen lamps can have a CRI as high as 100. Any lamp
rated above 80 CRI tend to be good color rendering.
What is the definition of footcandle or (fc) and how does it
compare to Lux (lx)?
A footcandle is a unit of luminance. One footcandle is equal to one
lumen per square foot (lmft2). A lighting designer would use a
measure of footcandles at the work surface to determine the proper
illumination level for home or office lighting. Lux is an
international metric unit of luminance. One lux is equal to one
lumen per square meter (lm/m2)
What is a kilowatt or (kw)?
A kilowatt is a measure of electrical power equal to 1000 watts.
What does average lamp life mean?
Average lamp life is a value for life expectancy based on laboratory
tests using controlled system characteristics measured in hours
where 50% are still operating.
What is Correlated Color Temperature?
This is a scientific measurement of the balance between the
wavelengths making up any “white” light. The unit of measurement is
in Kelvin (K) which determines the warm or cool appearance of a
light source. The lower the color temperature, the warmer or more
yellow is the appearance. The higher the color temperature, the
cooler or bluer is the appearance. Typical color temperatures are
2800K for incandescent, 3000K for halogen, 4100K for cool white, and
5000K for metal halide and daylight fluorescent lamps.
What is a ballast factor?
The percentage of rated lumens from the same lamp using a commercial
ballast as compared to an ANSI reference ballast. A ballast factor
of .96 means the commercial ballast produces 96% of light produced
by an ANSI reference ballast operating the same lamp. The ballast
factor can be referred to in the catalogs from fluorescent or HID
ballast manufacturers.
Who is the American National Standards Institute (ANSI)?
This is a professional organization that coordinates voluntary
guidelines and standards for lighting, electrical and other
industries.
What is rapid start ballast?
This is a type of fluorescent ballast that applies a low filament
voltage to preheat the cathodes. Simultaneously, a starting voltage
(lower than that used in instant start ballasts) is also applied to
strike the arc. When the cathodes are hot enough the lamp will
strike.
What does high power factor mean?
This is a measurement of the effectiveness of which an electrical
device converts amperages to watts. Power factors can range from 0
to 1.0. A high power factor means that the electrical system is
utilizing the power efficiently. Devises with power factors of
greater than .90 are considered “high power factor.”
What is voltage?
Voltage is the force or pressure of electricity. For incandescent
and halogen lamps, voltage generally refers to the line voltage of
which the lamp should operate. For HID, fluorescent, and low voltage
lamps, the voltage generally refers to the operating voltage is
connected to a power supply (ballast or transformer) after it is
warmed up.
What is Ohms law?
Volts X Amps = Watts
What is a watt?
A unit of electrical power used to indicate power consumption.A unit
of frequency equal to one cycle per second.
What are Initial lumens?
This is the quantity of light output measured after the first 100
hours of operation using controlled system characteristics.
What is the definition of Mean Lumens?
Average quantity of light output over the life of the lamp. High
pressure sodium and incandescent lamps are measures for mean lumens
at 50% of lamp life. Fluorescent and metal halide lamps are measured
for mean lumens at 40% of rated lamp life
Landscape Lighting |
Landscape Lighting Glossary
| Landscape Lighting Info
| Low Voltage Outdoor Lighting
Outdoor Lighting Safety |
Lighting Efficiency vs. Cost |
Lighting Activation
Outdoor Lighting Tips and
General Information for Buying Landscape Lighting
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