(JP7507166-W)      The solar panel unit includes a movable solar panel (10) which is mounted on a support carriage (12), displaced around a frame (13) via an electric motor, for optimum reception of solar energy. The intensity of the incident solar radiation is detected via a feedback control for the electric motor, for tracking the movement of the sun.    Pref. a fluorescent lamp (15) is supported within the frame behind a transparent lamp cover and in front of a reflector (17) and supplied from a battery pack which is recharged via the energy provided by the solar panel. Pref. 2 auxiliary solar panels offset from the plane of the main solar panel are coupled to a comparator circuit for controlling the electric motor.    USE/ADVANTAGE -   for powering solar lamp using energy stored in battery. Optimum reception of solar radiation throughout day by tracking sun.    (US5467257-A)      A solar panel unit comprising a movable solar panel arrangement support carriage and a drive motor for moving the carriage to orient the panel arrangement relative to the sunlight into optimum orientations for receiving solar energy, in which the panel arrangement comprises first and second main panels to convert solar energy into electrical power to charge a battery power pack, characterised in that the first and second main panels are angularly off-set slightly from one another and from a central mean optimum orientation of the panel arrangement, including means for sensing the intensity of solar energy being converted by the first and second main panels into respective first and second converted energies and controlling operation of the motor when there is an increasing energy difference between the first and second converted energies which exceeds a predetermined level of magnitude sufficient to move the panel arrangement towards optimum orientations as the sun moves relative to the unit.    (EP611432-B1)      The solar panel unit includes a movable solar panel (10) which is mounted on a support carriage (12), displaced around a frame (13) via an electric motor, for optimum reception of solar energy. The intensity of the incident solar radiation is detected via a feedback control for the electric motor, for tracking the movement of the sun.    Pref. a fluorescent lamp (15) is supported within the frame behind a transparent lamp cover and in front of a reflector (17) and supplied from a battery pack which is recharged via the energy provided by the solar panel. Pref. 2 auxiliary solar panels offset from the plane of the main solar panel are coupled to a comparator circuit for controlling the electric motor.    USE/ADVANTAGE -   for powering solar lamp using energy stored in battery. Optimum reception of solar radiation throughout day by tracking sun.