A light reflector frame has an upper wire frame and a lower wire frame each of generally rectangular form that are spaced apart and attached at an upper peripheral edge and a lower peripheral edge by a plurality of transverse brackets. At least four of the transverse brackets have a hook formed at a top end and a bottom end such that each of the hooks opens inwardly of the upper wire frame and the lower wire frame. At least one reflective panel is disposed inwardly of at least four transverse brackets to engage the hooks with a reflective surface of each reflective panel oriented inwardly of the transverse brackets. At least two pairs of opposed transverse brackets have an extended member at the top end positioned to extend upwardly over a cover of a horticultural lamp enclosure.