2018 LT Projection Bulbs
We just bought a 2018 LT and I was shocked that they didn't already come with LED projector bulbs... that said, before we bought the 2018, we were looking at buying a used 2017 LTZ (just over 9K miles) for about the same price, but it was a LTZ. It had the same projector type light housing as the 2018 does so I'm going to go out on a limb and say that they are probably going to be the same 9005 bulbs as "sincere" mentioned above. We took delivery last night 7/3/18 and I immediately bought a set of OPT7 (9005) through Amazon (link: amzn.to/2MKjDce).
These are the same ones (different housing #though) I put into our 2007 Toyota Prius and W O W ! ! ! what a huge difference in brightness and quality; AND they come with a 2 year warranty. I'll post pictures as soon as I replacement them, a side-by-side view.