Christie DS+5K, User Manual

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Section 3: Operation
User’s Manual 3-55
.
To use “
Intensity
” mode, judge by eye (or use a meter) and set the level as desired for
your application. Over time, the projector will automatically increase the power
supplied to the lamp as needed to maintain the chosen intensity as closely as possible.
This mode is known as “Brightness Tracking” or “LiteLOC

”.
HOW LONG CAN I MAINTAIN BRIGHTNESS?
Software can maintain your “
Intensity
”
setting until the required power reaches the maximum rating for the lamp. The lower
the setting, the longer it will take to reach this threshold and the longer you can
maintain the desired brightness. Keep in mind that once the lamp power reaches its
maximum wattage (see “
Power
”, above), this tracking is no longer possible. At this
point, the lamp will gradually begin to dim as usual, even though your original
“
Intensity
” value will still appear in the menu. To resume accurate tracking, reduce the
intensity setting so that the resulting “
Power
” value is less than its maximum—the
lower the intensity, the longer it can be maintained.
For example, a 1000-watt lamp can be driven at no more than 1000 watts. To produce
desired brightness at the screen, a new lamp would likely need less than this
maximum rating—perhaps 812 watts (example only). Over time, however, the lamp
will require more and more current in order to generate the desired light, until
eventually the lamp wattage reaches its 1000-watt maximum and the lamp power
automatically levels off. At this point, the tracking function terminates (i.e., the power
level stabilizes) and the lamp will begin to dim normally. Either reduce your
“
Intensity
” setting or replace the lamp.
Do not lower the “
Intensity
” so much that the corresponding “
Power
” value reaches its
minimum —the intensity setting will be inaccurate and cannot be maintained. For best
results in achieving uniform intensity amongst tiled images, choose an “
Intensity
”
setting that enables all lamps to operate at less than the maximum number of watts
available in your projector but high enough to keep the corresponding lamp power
above its minimum. See “
Power
”, above.
NOTES: 1) Lamps become more stable over time, thus a specific intensity is more
easily maintained as the lamp ages. 2) Intensity can be set only if the lamp is in
"Intensity" mode 3) Intensity cannot exceed the output of Max Brightness mode.
OPTICAL APERTURE -
The optical aperture inside the projector controls the diameter
of the light beam passing through the system.
With a fully open aperture (slide bar default of
“0”), the maximum amount of light passes
through for maximum brightness in your images.
Increase the slide bar setting to reduce the
aperture diameter and maximize contrast ratio instead.
LAMP HISTORY -
This read-only option lists the lamps most recently
installed and recorded in the projector. Lamp History automatically
updates whenever you record a new lamp serial number—the new
lamp is added to the bottom of the list.
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