elektraLite PaintCan 2.0 - Manual (Page 10)

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Please note if the preheat value is 0, when channel 6 (the dimmer channel) is at 0 dmx value, then the lamp
will be completely off.
This is recommended for places where the fixtures maybe run for several hours and where there will be a lot of “off” time
for the fixture. For example, store displays or church services or industrial presentations.
If using 0 preheat PLEASE make sure the lighting board actually will go down to 0 dmx value for the dimmer channel.
There are boards that do NOT actually go to 0 dmx value. The display on the lighting board may say 0 but in actual fact
the board does output a small dmx value like 1 or 2. That value is enough for the lamp to be ON and not OFF.
A preheat value above 0 is good for lamp life when the fixture will be faded up and down regularly,
or flashed/bumped up and down a lot. Working examples of this situation is in theatrical shows or rock-n-roll concerts.
A preheat value stops the filament from firing from off to on and back again too quickly.
If a preheat value is too high, the lamp will appear to be on and will of course never ‘appear’ to be off.
This is called “GHOSTING” of the lamp. The preheat should be set, so the lamp filament is just ‘on’ and not really that visible
to the naked eye.