ETC ColorSource ThruPower Series User Manual page 19

The ColorSource ThruPower is capable of dimming or switching multiple load types, including
incandescent, low voltage, and 2-wire fluorescent. You can choose from four output curves:
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Mod-Square: The mod-square curve
provides a non-linear relationship between
control level and voltage. For most tungsten
lamps, this provides the best relationship
between brightness and level, and is the
default.
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Fluorescent: The fluorescent curve
provides a linear curve which steps to 46%
level when the level is raised above zero –
this is helpful with dimmable fluorescents
and other non-tungsten loads. This initial
voltage is 47% of the incoming voltage.
Menu structure
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Control Input
Linear: The linear curve
provides a linear relationship
between input control level
and output voltage
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Control Input
Preheat: The preheat curve
provides a fixed preheat at 5% of
the incoming voltage (12V assuming
a 230V input). Preheat is used to
extend lamp life when lamps are
being turned on rapidly from cold.
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