| http://www.w3.org/ns/prov#value | - ive to an insolation intensity for producing a second sensor signal indicative of a sensed value of insolation intensity; and a control unit responsive to the first and second sensor signals for operating the control device in one of the first, second and third modes, the control unit including means for increasing a ratio of the first time period to the second time period with increasing insolati
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