Two housing heights allow flush or regressed diffuser placement 1-T8 and 1- or 2-T5 or T5HO cross-sections available Lighted 90-degree and 135-degree corners available Spackle flange option available (RP-D-4400) Mounts in rows for continuous-line-of-light A "new generation" Mod fixture with 30% smaller housing. The new Mod2 fixtures offer a choice of T8, T5, or T5HO lamping, and a choice of three baffle types. "R" fixtures are designed for plaster, drywall, concealed spline ceilings. Other Mod fixtures are available for exposed grid ceilings as well as pendant- surface- or wall-mounted applications.