Measure the length of the stairwell from the bottom all the way to the top along the diagonal. Select enough strings of LED lights to match the measurement.
Heat up a hot glue gun for 10 minutes.
Squeeze a line of hot glue along the top angle of the stairwell opposite from the stair lift.
Press strings of LED lights onto the hot glue line. Make sure that the plug at the end of the strings can reach an electrical outlet. Allow the hot glue to cool and harden for two minutes.
Plug in the strings of LED lights to illuminate the stair lift.