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C O N F I D E N T I A L
2 3 - A u g - 9 9
(TDQGOLQJ
Observe the following to ensure proper operation and integrity of the
equipment.
/DPSV
When handling a lamp, hold it by the ceramic base while wearing cotton
gloves or finger cots. Do not touch the glass envelope (bulb). If you touch
the glass with bare fingers, wipe off any fingerprints with alcohol.
Luminaires will have a hot lamp when operating. Disconnect power and
allow lamp to cool before replacing.
When Operating Arc Lamps
Allow arc lamps to operate for at least 3 minutes. It takes about 3 minutes
for the fill components (mercury and halogen-metal compounds) in the
lamp tubes to vaporize completely. If the lamps are doused sooner than 3
minutes, the fill components are partially vaporized. The inadequately
vaporized fill components and the electrode material (tungsten) are
deposited in areas of the envelope that have remained cool. As a result, the
lamp blackens prematurely.
If system will be unattended for more than two hours, lamps should be
doused. Standby mode should not be used for more than two hours.
If an arc luminaire is struck, the luminaire should be maintained in a hori-
zontal position when not in use.
All arc luminaire heads should be tilted horizontal before starting lamps.
Lamps generate light by an electrical discharge arc, whereby the electrons
from two electrodes excite the fill components to give off light. Because of
the alternating current position, the electrons are alternately given off by
the two electrodes. When a lamp is set in a vertical position, the halogen-
metal compounds, which determine the color temperature of the lamp,
collect at the top end of the glass envelope. When the lamp is struck, color
deviations occur since the concentration of halogen compounds is greater
around the top electrode than the bottom electrode. In addition, the fill
components that are difficult to vaporize congeal around the bottom elec-
trode, thereby reducing lamp life.
