I would suggest being real careful changing any of the safety lights on a vehicle, i.e. stop, signals, etc. If you compromise the performance of these lights and you get in an accident, you will be considered to have had no lights if the other insurance company or person has a smart investigator...... and they do look for it.
A light on a vehicle is a system consisting of the bulb, reflector and lens. The result is a specific lighting pattern. If you change from a bulb to a LED, you are quite likely creating holes in the lighting pattern even if the total amount of light goes up.
Lux-III bulb replacements are probably bordering on the impractical due to thermal issues and loss of light due to heat.
Semiman