Another 7.5W tube! This time, however, pushed to maximum power 5A, collimated with a 3X or 5X beam expander? Nice heat sink, looks like part of a Saber, powered by 2 26650 cells? But if you have an SXD, did you insert a hollow contact edge inside? With or without a brass spring? Or is there a small ridge that retracts when the cells are pressed and makes electrical contact?