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The following applies to 2013-2015 GS's only (there were LED updates done on the '16 refresh):
1) The trunk bulb is a standard 194. Diode Dynamics sells an LED board that fits directly into the light housing. I believe there is an LED strip by iJDMToy and one from PrecisionLED.
2) Puddle Lights are 194. Any quality 194 LED replacement will do (iJDMToy or VLED)
3) Door Courtesy Lights: See #2 above.
Reverse bulbs (921) can be changed to LED. Any quality 921 LED will do.
Front (7443) and Rear Turn Signals (7440) can also be changed to LED but will require a relay to prevent hyper flashing.
Fog lights (H11) can be changed out to LED (lots of folks also do HIDs).
JDM ASTAR 5GS Brgiht White LED Bulbs For Backup Reverse Lights
Three days ago I installed JDM ASTAR 5GS Brgiht White LED Bulbs For Backup Reverse Lights on my 2018 EX 300h. So far Works well. Bright light. Fit well. Satisfied with the result. Check the pictures.