Reduced-Intensity Regimen Before Allogeneic Transplant for Patients With Relapsed Non-Hodgkin's or Hodgkin's Lymphoma

RATIONALE: Photopheresis allows patient white blood cells to be treated with ultraviolet (UV) light and drugs outside the body to inactivate T cells. Pentostatin may suppress the immune system and reduce the chance of developing graft-versus-host disease (GVHD) following bone marrow transplantation. Combining photopheresis with pentostatin and total-body irradiation may be effective in killing cancer cells before bone marrow transplantation. PURPOSE: This phase II trial is studying how well giving photophoresis together with pentostatin and total-body irradiation as a reduced-intensity regimen before allogeneic bone marrow transplantation works in treating patients with relapsed non-Hodgkin's or Hodgkin's lymphoma.