An LED insert for a lighting fixture housing, the LED insert comprising: an elongate thin contoured portion comprising: a raised central mount surface extending along its length, the raised central mount surface bordered on opposing sides by a first vertical wall and a second vertical wall both extending downward from the raised central mount surface; an angled flange that extends outward from the bottom of the first vertical wall; an angled edge lip that extends outward and downward from the outer edge of the angled flange, the angled edge lip being angled downward between about 10 and 30 degrees from a top surface of the angled flange, the angled edge lip being configured for insertion into a groove extending along the length of an interior side of an elongate lighting fixture; a tab flange extending outward from the bottom of the second vertical wall; a plurality of locking tabs spaced along and extending upward from an outer edge of the tab flange, the locking tabs removably engaged with an overhanging feature of an elongate lighting fixture; and a LED printed wiring assembly mounted on the raised central mount surface, the LED PWA comprising a plurality of LEDs. an elongate thin contoured portion comprising: a raised central mount surface extending along its length, the raised central mount surface bordered on opposing sides by a first vertical wall and a second vertical wall both extending downward from the raised central mount surface; an angled flange that extends outward from the bottom of the first vertical wall; an angled edge lip that extends outward and downward from the outer edge of the angled flange, the angled edge lip being angled downward between about 10 and 30 degrees from a top surface of the angled flange, the angled edge lip being configured for insertion into a groove extending along the length of an interior side of an elongate lighting fixture; a tab flange extending outward from the bottom of the second vertical wall; a plurality of locking tabs spaced along and extending upward from an outer edge of the tab flange, the locking tabs removably engaged with an overhanging feature of an elongate lighting fixture; and a LED printed wiring assembly mounted on the raised central mount surface, the LED PWA comprising a plurality of LEDs. a raised central mount surface extending along its length, the raised central mount surface bordered on opposing sides by a first vertical wall and a second vertical wall both extending downward from the raised central mount surface; an angled flange that extends outward from the bottom of the first vertical wall; an angled edge lip that extends outward and downward from the outer edge of the angled flange, the angled edge lip being angled downward between about 10 and 30 degrees from a top surface of the angled flange, the angled edge lip being configured for insertion into a groove extending along the length of an interior side of an elongate lighting fixture; a tab flange extending outward from the bottom of the second vertical wall; a plurality of locking tabs spaced along and extending upward from an outer edge of the tab flange, the locking tabs removably engaged with an overhanging feature of an elongate lighting fixture; and a LED printed wiring assembly mounted on the raised central mount surface, the LED PWA comprising a plurality of LEDs.