Patent ID: 7997752

Claim:
A lighting device, comprising: a light collecting unit comprising a lens barrel with a light incident opening defined at a first end thereof, a lens having a central portion and a peripheral portion, and an optical leveling element, the lens received in the lens barrel with the central optical portion aligned with the light incident opening, the optical leveling element received at a second end of the lens barrel and comprising a light guide plate having a dot pattern, the dot pattern facing toward the lens, a refractive index of the dot pattern gradually increasing from a center of the dot pattern to a periphery of the dot pattern; a solar cell panel aligned with the optical leveling element, and configured for receiving light transmitted through the optical leveling element and converting the light into electrical energy; a storage battery; a lighting element electrically connected to the storage battery; and a control unit connected to the solar cell panel and the storage battery, and configured for controlling the solar cell panel to power the storage battery and controlling the storage battery to power the lighting element.