Side-lighting surface lamp, comprising a frame, LED module, light guide device and backplate, characterised by the total L-shape of the one-sided cross-section of the frame, the one-sided cross-section from inside to outside with a first step in succession, is fitted with an inner mounting surface and an upper mounting surface, with the light-guide device mounted on the first lead, the LED module firmly mounted on the inner mounting surface, where the rear plate is covered over the conductor arrangement and is fixed to the upper mounting surface by a connecting piece.
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