FIG. 1 is a perspective view of the lamp according to the present invention; FIG. 2 is a front view of the lamp thereof; FIG. 3 is a back view of the lamp thereof; FIG. 4 is a right view of the lamp thereof; FIG. 5 is a left view of the lamp thereof; FIG. 6 is a top view of the lamp thereof; and, FIG. 7 is a bottom view of the lamp thereof. The broken-line disclosure represents portions of the lamp which form no part of the claimed design.