Retaining instant turn on capability, ALTLED® T8 incorporates aluminum heat-sink outer casing, military grade A-class components, and temperature-resistant, solid-state capacitors that ensure consistent operation down to -85°F. Light produces 104 lm/W throughout entire 50,000 hr life span, and IP65 rating is supported by multiple waterproof installation options. Other than double-pin fixtures, tubes are compatible with single-pin T8 socket designed for refrigeration applications.