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XII.12
W
Wall Temperature (Maximum Bulb)
The maximum operating bulb wall temperature
in Celsius.
Warm-Up Time
HID lamps typically take a few minutes to warm
up to full brightness after starting.
Warm Up Time to 90%
The time it takes for a High Intensity Discharge
lamp to reach 90% of light output after being
turned on.
Warm White
Refers to a colour temperature around 3000K,
providing a yellowish-white light .
Watt
A unit of electrical power. Lamps are rated
in watts to indicate the rate at which they
consume energy (See KILOWATT HOUR).
Wattage Indicator Reduced
Indicates that this is a reduced wattage option for
lamps normally used in this application. Be sure
to check wattage, lumens and life to determine
which lamp is best suited to your needs.
Watt-Miser™
A Watt-Miser™ lamp is a term used by GE
to indicate a reduced-wattage lamp with
performance characteristics (life, light output ,
etc.) such that it can usually directly replace a
higher-wattage product . Watt-Miser™ lamps
are available in a wide range of incandescent
and fluorescent lamp types.
Wavelength
The distance between two neighboring crests
of a traveling wave. The wavelength of light is
between 400 and 700 nanometers.
WEEE (Waste Electrical and Electronic
Equipment)
The Waste Electrical and Electronic Equipment
Directive (WEEE Directive) aims to minimise
the impact of electrical and electronic goods
on the environment , by increasing re-use and
recycling and reducing the amount of WEEE
going to landfill. It seeks to achieve this by
making producers responsible for financing
the collection, treatment , and recovery of
waste electrical equipment , and by obliging
distributors to allow consumers to return their
waste equipment free of charge.
Work Plane
Plane at which work is done and at which
illumination is specified and measured; unless
otherwise indicated, it is assumed to be a
horizontal plane 30 inches above the floor (table-
top height) having the same area as the floor.
Working Distance (Typical)
The Working Distance shown is the distance
from the front surface of the reflector rim to
the film plane, in the optical system for which
the lamp was first designed. In most cases,
it provides a uniform plane of light for the
intended aperture.