Linear, Quick, Output frequency – ETC Desire Series XTI v1.6.0 User Manual

Page 37: Red shift

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Operation

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Linear

Linear has no curve. Brightness levels correlate exactly with the value of the dimming

control signal. Moderate lag in response for good dimming smoothness. Linear allows quick

jumps in brightness. It is best for studio lighting and applications with static scenes or looks.

Quick

Quick uses the standard dimming curve but with no lag or smoothing. All changes are

instant and correlated exactly with the control input signal. Quick is best for extreme high

impact and video-based control.

Output Frequency

Output Frequency is the frequency in Hz at which the LED array pulses, or blinks, as a

function of Pulse-Width Modulation (PWM). The frequency is adjustable in order to avoid

visible flicker on video and film. When altering the frequency in order to reduce noticeable

flicker on camera, often only a small change is required. The range is 920 to 30,000 Hz in

increments of 10. The default value is 1200 Hz.

For high speed exposure or rolling shutter cameras, use 25,000 Hz to increase the PWM

which will result in flicker-free operation in most circumstances.

Changing the frequency from the default value can have a slight impact on the smoothness,

color-mix consistency, or both when dimming.

Red Shift

Red shift allows the fixture to match its dimming performance to that of a conventional

tungsten lamp as it dims. The fixture automatically changes its apparent White Point, or

color temperature, as a function of overall intensity. Red shift works with both white-light

and colored-light output settings. It is also known as amber drift and tungsten shift. Red shift

is available only in the HSI and RGB profiles. It is not available on Studio Daylight and

Studio Tungsten fixtures.

White Point (Vivid, Lustr+, Fire, Ice, and Studio HD)

White Point controls the appearance (color temperature) of white-light output when

saturation is at or near zero. This option is available when using the HSI and RGB profiles.

The choices are 2950K, 3200K, 5600K, and 6500K.

DMX

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Intensity

DMX

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255

Intensity

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