a horticultural light fixture for reducing the temperature impact of the light source on growing plants , including a hollow sheet metal tube , having first and second round hollow ends and a cutaway portion on the underside open towards the plants with at least one lamp socket mounted within said metallic tube , locating the lamp over the cutaway portion , further including a reflector mounted within the metallic tube and extending out through the cutaway portion , constructed and arranged to deflect light from the lamp toward the plants , having a transparent portion fittingly attached to the reflector between the lamp and the plants being impermeable to the heated atmosphere while allowing light to pass through .