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About LED refresh rate
When using LED lighting with cameras, flickering can occur due to incompatible frequency settings, which means the LEDs and the
cameras are not synchronised.
In order to avoid flickering and horizontal banding (rolling shutter), the refresh rate (frequency) can be adjusted in order to achieve
flicker-free performance.
Setting the LED refresh rate (frequency) via DMX
The G-Spot Turbo offers the ability to adjust the refresh rate (frequency) of the LEDs via DMX, by using the ‘Control Channel’.
To find all 'Control Channel' settings, see the DMX charts available at http://www.sgmlight.com under G-Spot Turbo, or upon request
via [email protected].
The refresh rate can be set between 100,00 kHz and 1,41 kHz. It is recommended to have the G-Spot Turbo configured to operate the
default refresh rate by setting the ‘Control channel’ to 0 through DMX whenever possible (0% - factory default settings), to maintain
the best possible dimming performance.
The refresh rate settings are active as long as the value of the ‘Control Channel’ is set up. The value should be stored as a preset or
as a default value for the ‘Control Channel’ in the control device.
Be aware that the ‘Control Channel’ is also used for fixture reset functions and DMX capture for the internal sequence editor.
When adjusting a custom value, you want to choose a frequency high enough to avoid flickering, and/or horizontal banding (rolling
shutter), but low enough to maintain a good dimming performance.
Since there are differences between camera models, exposure settings etc., the optimal refresh rate settings will differ. In order to
achieve the best result, adjust the refresh rate through a preview monitor connected to the cameras.
See on page 12 the LED Frequency in kHz according with the different DMX steps/values.
LED refresh rate (frequency)
