Sylvan Signs
Glossary - L
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lacing:
A common method of attaching
a fabric covering to the
frame of an awning. It is
tied to the frame using thin
rope that is threaded (laced)
through grommets at the edge
of the fabric.
lacquer:
A clear glossy coating applied
to material for appearance
and protection. Known for
its ability to dry quickly.
Similar to varnish but provides
a harder finish.
lambert:
A unit of measure of luminance
(brightness). One lambert
is the luminance of a surface
that emits or reflects one
lumen per square centimeter.
One lambert = 0.318 foot-candles
per square centimeter.
laminated fabric:
Two or more layers of fabric
(natural and/or synthetic)
joined together with an adhesive.
(See also lamination.)
laminated glass:
Two sheets of glass bonded
to an inner layer of transparent
plastic. For signage, lettering
and graphics can be applied
to the plastic layer prior
to bonding. Laminated glass
also provides a measure of
safety as the bonded plastic
layer helps prevent the glass
from shattering if broken.
In addition, laminated glass
has greater sound reduction
qualities when compared to
glass alone. (See also lamination.)
lamination:
The process of binding together
two or more layers of material
by means of one or more of
the following: heat, pressure
and adhesive bonding. (See
also delamination.)
lamp bank:
The array of lamps (lights)
in a message center that
are used to create the messages
seen by the public.
landscape format:
An image or sign panel where
the length is appreciably
greater than the height is
said to be in landscape format.
laser:
A highly focused beam of
light that when generated
with sufficient power can
be used for the purpose of
engraving or cutting material.
layout:
The overall arrangement of
the graphics and lettering
on the face of a sign.
LCD (liquid crystal
display): A type
of flat panel display that
recreates an image or message
through the manipulation
of electrically sensitive
crystals suspended in a
liquid medium. Commonly
used in electronic message
centers.
LED (light emitting
diode): A small
electronic device that
emits light when electrically
charged. In computer controlled
arrays, LEDs can used to
create an electronic message
center.
letter spacing:
A typographic term for the
space between letters and
words.
life safety signs:
Signage that conveys life-saving
information such as important
fire, security and evacuation
information. The specific
types of life safety signage
required are determined by
local, state and federal
regulations.
light box:
A sign that is self enclosed
in a typically square or
rectangular structure and
houses an internal light
system for illumination of
the sign face. (See also
box sign.)
light emitting
diode (LED): A
small electronic device
that emits light when electrically
charged. In computer controlled
arrays, LEDs can used to
create an electronic message
center.
light reflectance
value (LRV): An
indication of the relative
amount of light reflected
by a given color. For example,
yellow has a higher LRV
than blue.
line screen:
The resolutions of a halftone
print measured in lines per
inch. The higher the number
of lines per inch, the higher
the resolution of the resulting
print. Most halftone printing
is at a line screen resolution
of 133 and 175 lines per
inch.
line spacing:
A typographic term for the
space between lines or blocks
of text.
liquid crystal
display (LCD) sign:
A type of flat panel display
that recreates an image
or message through the
manipulation of electrically
sensitive crystals suspended
in a liquid medium. Commonly
used in electronic message
centers.
load:
Any measurable force exerted
on a structure or object.
Things that can add load
to a sign and its supporting
structure include water,
snow and wind. (See also
dead load.)
logo:
A visually distinctive name
and/or symbol that identifies
a business, product or service.
(See also trademark.)
low profile sign:
A freestanding sign built
close to the ground or on
top of a base sitting directly
on the ground. Often incorporates
the support structure into
the overall design. (See
also monument sign.)
low voltage:
Voltage not exceeding 1000V
AC or 1500V DC between conductors,
or 600V AC or 900V DC between
conductor and ground.
LRV (light reflectance
value): An indication
of the relative amount
of light reflected by a
given color. For example,
yellow has a higher LRV
than blue.
lumen:
A measurement of light output.
One lumen equals the amount
of light falling on a one
square foot area located
one foot away from a single
candle.
luminance:
The intensity of a light
emitted by a source as measured
in a given direction. Luminance
is a measure of the amount
of light only. It is expressed
as footlamberts or candelas
per square foot or meter
respectively.
luminance ratio:
With an illuminated sign,
some areas of the sign face
will have a higher luminance
than others. The difference
in luminance between any
two areas is referred to
as the luminance ratio.
luminescence:
The quality of emitting light
by absorbing radiant energy
from another source and converting
it into a visible wavelength.
(See also fluorescent lamp.)
luminous efficacy:
The amount of light produced
by a lamp as measured in
lumens compared to the amount
of energy the lamp consumes.
luminous flux:
The total visible light energy
emitted by a source in all
directions, where the luminous
flux is the radiant flux
multiplied by the human eye's
sensitivity. The unit of
measurement for luminous
flux is the lumen.
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Signs today at 503.430.8072!
