OmniSistem PR XL 250 - Manual (Page 15)

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Remark:
If you intend to turn on/off the lamp via the last channel of the controller, don’t attempt to push the channel to value
224-255 immediately after turning it off, or push the slide bar to value 224-255 to wait it cooling. Under these 2
circumstances, the lamp can not be turned on. The right operation is: turn it off---cool down---push the slide bar to turn it
on.