Runco Video Xtreme VX-40d Owner's Operating Manual page 68

Section 3: Operation
POWER – This slidebar and number indicates how many
watts are applied to the lamp. You can apply anywhere
from approximately 60-65% of the maximum power intended for the installed lamp up to
100% of the lamp rating. Set for the number of watts as desired, keeping in mind that
lower power levels produce dimmer images. When in either Power or Max Brightness
modes, the power level remains constant. Specifying a maximum power level here is the
same as operating in Max Brightness mode.
NOTES: Power level can be set only if the lamp is in Power mode.
INTENSITY – This value and slidebar represents the
current brightness of your lamp, decreasing over time
when you are operating in Max Brightness mode or at a specific Power level. When
you are operating in "Intensity" mode this value remains at the original "Intensity" setting
chosen and cannot be adjusted.
NOTE: The number shown for "intensity" is not the actual lumen output, but rather a
correlated value only—1246 may represent 3500 lumens, for example.
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.
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.
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