I would make a guess that they were the bulbs for the DRL (daytime running lights).
On the light stalk, see if there is a DRL position or an AUTO position. If so, twist the switch to that. Then start the car and put it in R or D and while stepping on the brake, have someone go see if those bulbs light up.
When in doubt, read the manaul. If you don't have a manual, log into www.lexus.com, go to the owners section, register, and request a free one.
steviej