diff --git a/src/phoebus_driver.cpp b/src/phoebus_driver.cpp
index 38ceb8f3d..46c7e7dd7 100644
--- a/src/phoebus_driver.cpp
+++ b/src/phoebus_driver.cpp
@@ -698,11 +698,13 @@ TaskListStatus PhoebusDriver::RadiationPostStep() {
     if (do_lightbulb) {
       pdo_gain_reducer = rad->MutableParam<parthenon::AllReduce<bool>>("do_gain_reducer");
     }
-    TaskRegion &async_region = tc.AddRegion(num_independent_task_lists);
-    for (int ib = 0; ib < num_independent_task_lists; ib++) {
-      auto pmb = blocks[ib].get();
-      auto &tl = async_region[ib];
-      auto &sc0 = pmb->meshblock_data.Get(stage_name[integrator->nstages]);
+    //creating a new sync region for light bulb functions
+    TaskRegion &sync_region_lb = tc.AddRegion(num_partitions);
+    for (int ib = 0; ib < mun_partiotions; ++ib){
+      auto &base = pmesh->mesh_data.GetOrAdd("base", ib);
+      auto &sc0 = pmesh->mesh_data.GetOrAdd(stage_name[stage-1], ib);
+      auto &sc1 = pmesh->mesh_data.GetOrAdd(stage_name[stage], ib);
+      auto &tl = sync_region_lb[ib];
       auto finish_gain_reducer = none;
       if (do_lightbulb) {
         auto calc_tau = tl.AddTask(none, radiation::LightBulbCalcTau, sc0.get());
@@ -717,9 +719,9 @@ TaskListStatus PhoebusDriver::RadiationPostStep() {
             tl.AddTask(start_gain_reducer, &parthenon::AllReduce<bool>::CheckReduce,
                        pdo_gain_reducer);
         int reg_dep_id = 0;
-        async_region.AddRegionalDependencies(reg_dep_id++, ib, finish_gain_reducer);
-      }
-
+      
+    }
+   
       auto calculate_four_force =
           tl.AddTask(finish_gain_reducer, radiation::CoolingFunctionCalculateFourForce,
                      sc0.get(), dt);