SkyTracker STX-1-2000 - Reflector Assembly; Lower Bulb Support; Air Plenum;Duct; Upper(Anode) Bulb Adapter

The xenon lamphead has been designed and constructed for ease of operation and ser-
viceability in extreme weather conditions and operates satisfactorily in rain or snow. In op-
eration,thelampheadisslightlypressurizedasaresultofthecoolingairinow,thusaiding
in the exclusion of dust or moisture. The basic components are shown in Figure 9.
The two primary components of the lamphead are the deep dish electroformed parabolic
reectorandthexenonbulb(lightsource).Tofunctionefciently,thesecomponents
must be mounted in such a manner that the bulb can be carefully positioned with its radi-
antenergysourcepreciselylocatedatthefocalpointofthereector.Thebulbmustbe
capableofadjustmentastoitsrelationshipwiththereectortooptimizetheprojected
beam characteristics. All electrical connections to the bulb must be of low resistance and
capable of carrying relatively high currents (50 to approximately 160 Amps.) and cooling
must be constant and effective to maximize bulb life and minimize electrical conductiv-
ity problems that can result from overheating. The components, which accomplish these
functions, are noted below.
7.1 REFLECTOR ASSEMBLY
Theelectroformedparabolicreectorisprecisionbondedtoacircularsupportring,which
inturnboltstothelamphousetubularframe.Ifreplacementisrequired,rstremovethe
lamp as noted in section 9.0. Next, detach the upper support spider and associated com-
ponents.Finally,unboltthereectorfromthelamphousetubularframe.
7.2 CATHODE SUPPORT
The rear, or cathode (-) end of the xenon bulb is supported by slotted bulb guides, which
are bolted to the bottom of the air plenum. This allows the bulb to move freely in the verti-
cal axis for beam adjustment and to eliminate strain on the quartz envelope of the bulb.
7.3 AIR PLENUM/DUCT
Theairplenumisattachedtothebasecentersupportbafeandprovidesameansofduct-
inganddirectingtheairowaroundandoverthexenonbulbtothefront,oranode(+)end
of the bulb.
NOTE: It is mandatory that heat be properly removed from the anode end of
the bulb to avoid damage to its internal seal.
7.4 ANODE ADAPTER
The upper bulb adapter, which is a tubular section surrounding the front portion of the bulb
and attaches to the anode (+) end of the bulb, serves a dual purpose. The point of attach-
ment to the bulb and also provides a means of removing heat from the bulb by direct
conduction. As the heat is conducted outward from the bulb into the front bulb adapter, it
spreads outward into the tubular section of the adapter by conduction. It is then removed
by convection to the air stream, which has been directed over the bulb by the air duct.
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