Patent ID: 7569802

Claim:
A photosensor control unit for use in a lighting module producing and directing light within a first range of wavelengths substantially downwardly toward a substantially horizontal target surface, a housing of the lighting module having a substantially downwardly-facing inner surface, the photosensor control unit comprising: a circuit board having a plurality of LEDs, the circuit board being mounted adjacent the inner surface of the housing of the lighting module such that the LEDs are substantially downwardly-directed, the LEDs being configured to produce light within the first range of wavelengths; a light sensor mounted on the circuit board adjacent the LEDs such that the light sensor is oriented in a substantially downwardly-facing direction toward the target surface, the light sensor being responsive to light having wavelengths within a second range of wavelengths, wherein the second range of wavelengths is exclusive of the first range of wavelengths; a switch electrically connected to the lighting module and the light sensor, the switch adapted to operably control the lighting module responsive to the light sensor; and a lens installed in the housing substantially parallel to and offset from the circuit board on which the LEDs and the light sensor are mounted, wherein the lens comprises: an intermediate first portion of the lens that is substantially transparent to the light within the second range of wavelengths to which the light sensor is responsive, the first portion being positioned substantially adjacent to the light sensor, whereby the first portion of the lens functions to optically focus the light sensor to receive light within the second range of wavelengths reflected from the target surface and traveling substantially upwardly in a second direction; and at least one second portion of the lens about the first portion, the at least one second portion being positioned substantially adjacent to the LEDs and being substantially transparent to the light emitted by the LEDs within the first range of wavelengths, whereby the at least one second portion of the lens distributes the light emitted by the LEDs substantially downwardly toward the target surface, whereby the lighting module emits light via the LEDs having wavelengths within the first range of wavelengths responsive to the absence of light within the second range of wavelengths detected by the light sensor.