The halogens in the car are 55 watt - people have had complaints in the past about replacing them with 60 watt versions. 30 is obviously less than 55, but I have no idea about heat dissipation for LEDs.
I have LED bulbs in the Subaru - due to the difficulty of installing bulbs based on the 2014 design, even if they weren't better (they are), longevity would be reason enough.
I just replaced the housings, so I'd hate to burn them. I also find the Boxster (2000 era) has terrible visibility, so any improvement would be a huge gain.
I'm just surprised that nobody has attempted this.
Andrew