| http://www.w3.org/ns/prov#value | - Preferably, one of the LEDs is selected to produce light (at the current at which the LED is to be operated) having a wavelength substantially corresponding to the peak scotopic sensitivity of the human eye and another is selected to produce light (also at the current at which the LED is to be operated) having a wavelength substantially corresponding to the peak photopic sensitivity of the human e
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