Energy par - flat lamp with hot cathodes (8), consisting of a gas-tight transparent glass body (20), which is provided with a low pressure mercury, noble gas - steam mixture is filled, the heating of a in the glass body (20) mounted to the cathodes pair and applying an ignition voltage in the plasma is gaseous state, uv - radiation and thus a on the inside in the glass body (20) has a luminescent attached to the illumination light excites and thus produced, characterized in that the gas-tight transparent glass body (20) two planar walls (3, 4), the two narrow side walls (1, 2) are held in a small distance from one another, in addition, the glass body, two further narrow side walls (5, 6), as well as glass webs (9) in the interior, the parallel to the side walls (1, 2) lie, but are shorter than this, and is arranged so that a serpentine shape of square plasma channel (10) for a correspondingly folded fluorescent lamp is.
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