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XII.10
For GE LED products, rated life is quoted (unless
where indicated otherwise), as the ‘L70’ value.
This refers to the time taken to reach 70%
of initial lumen output . This is the emerging
industry standard for LED products.
Reflectance
The ratio of light reflected from a surface to that
incident upon it .
Reflector Lamp (R)
A light source with a built-in reflecting surface.
Sometimes, the term is used to refer specifically
to blown bulbs like the R and ER lamps; at
other times, it includes all reflectorized lamps
like PAR and MR. Most LED lamps are also
replacements for reflector lamps, even if they
do not physically have a reflector as part of
their construction.
Reverse Voltage (VR)
Voltage across the diode for a given reverse
current .
RoHS (Restriction of Hazardous Substances)
The Restriction of Hazardous Substances (RoHS)
Directive aims to minimise the environmental
impact of waste electrical and electronic
equipment by reducing the quantities of four
heavy metals and two brominated flame
retardants that it may contain.
Room Cavity Ratio (RCR)
A shape factor (for a room, etc.) used in lighting
calculations.
RCR = 5H (L+W) / L x W, or, alternately,
RCR = (2.5) Total Wall Area / Floor Area.
Where H = height , L = length and W = width of
the room. A cubical room will have an RCR of
10; the flatter the room the lower the RCR.
S
State and County Code (SCC)
The full 14 digit case code used on GE’s content
label.
Scotopic
Vision where the rods of the retina are
exclusively responsible for seeing, typically
like the light levels in the countryside on a
moonless, starlit night (See also PHOTOPIC ,
FOVEA, FOVEAL VISION MESOPIC).
Scotopic/Photopic (S/P) Ratio
This measurement accounts for the fact that
of the two light sensors in the retina, rods are
more sensitive to blue light (scotopic vision)
and cones to yellow light (photopic vision). The
scotopic/photopic (S/P) ratio is an attempt to
capture the relative strengths of these two
responses. S/P is calculated as the ration of
scotopic lumens to photopic lumens for the
light source on an ANSI reference ballast . Cooler
sources (higher colour temperatures lamps)
tend to have higher values of the S/P ratio
compared to warm sources.
Screw-In
(See CFL ).
Seal Temperature (Maximum)
The maximum operating temperature of the
seal of the lamp in Celsius.
Self-Ballasted Lamps
A lamp with an integral ballasting device
allowing the lamp to be directly connected to a
socket providing line voltage (See CFL).
Series Lamp Operation
Refers to ballasts that employ a single current
path passing through all lamps operated by
the ballast . If one lamp should fail, companion
lamps operated by the same ballasts will also
extinguish or dim.
Source Size
For Projection lamps, this is defined as the
dimensions of the rectangular area, centered on
the lamp axis, within which all luminous parts
of the filament lie, when viewed perpendicular
to the axis of the filament coil or to the plane of
C-13 and C-13D filaments.
Spacing to Mounting Height Ratio
Ratio of fixture spacing (distance apart) to
mounting height above the work plane;
sometimes called spacing criterion. It is OK to
have fixture spaced closer than the spacing
criterion suggested by the manufacturer
but not farther, or you will get dark spots in-
between fixtures.
Specification Series (SP) Colours
Energy-efficient , all-purpose, tri- phosphor
fluorescent lamp colours that provide good
colour rendering. The CRI for SP colours is 70 or
above and varies by specific lamp type.
Specification Series Deluxe (SPX) Colours
Energy-efficient , all-purpose, tri- phosphor
fluorescent lamp colours that provide better
colour rendering than Specification Series (SP)
colours. The CRI for SPX colours is 80 or above
and varies by specific lamp type. All GE CFL
products use SPX phosphors.
Specification Series Deluxe eXtreme (SPXX)
Colours
A colour designation for GE ceramic metal halide
lamps with superior colour rendering ~ 90.
Spectral Power Distribution (SPD)
A graph of the radiant power emitted by a
light source as a function of wavelength. SPDs
provide a visual profile or “finger print” of the
colour characteristics of the source throughout
the visible part of the spectrum.
Spectrum
See SPECTRAL POWER DISTRIBUTION (SPD) .
Specular Reflection
Reflection from a smooth, shiny surface, as
opposed to diffuse reflection.
Spiral™ Lamp
GE trademark for its helical family of high
efficiency, long-life compact fluorescent lamps.
Spot
A colloquial term referring to a reflector lamp
with a tight beam of light , typically around 10
degrees or less. It comes from the fact that
such a lamp produces a narrow spot of light as
opposed to a wide flood of light .
SPXX
A Colour Designation for GE Ceramic Metal Halide
Lamps with superior Colour Rendering ~ 90.
Starcoat™
GE’s special barrier coating applied on the
inside of all GE T8 fluorescent lamps, as well as
some other lamp types, to enhance lamp life
and deliver superior lumen maintenance.
Starter
An electronic module or device used to assist
in starting a discharge lamp, typically by
providing a high-voltage surge (See IGNITOR).
Starting Temperature (Minimum)
The minimum ambient temperature at which
the lamp will start reliably.
Sunburn
Skin reddening and inflammation caused by
overexposure to sources containing UV-B
and/or UV-C.
System
A term referring to the lamp and ballast
combination, and sometimes to the entire
lighting delivery system including the fixture,
the optics, the thermal management system,
the particular layout and the lighting controls.