Well one of my license plate light bulbs burned out, easiest change on a LS.
the info below might be of some help to someone.
1999 Lexus LS400 Car Light Bulb Socket Sizes
Low Beam Headlight Bulb Size: 9006
High Beam Headlight Bulb Size: 9005
Parking Light Bulb Size: 2825
Front Turn Signal Light Bulb Size: 7440
Rear Turn Signal Light Bulb Size: 7440
Tail Light Bulb Size: 7443
Stop Light Bulb Size: 7443
High Mount Stop Light Bulb Size: 921
Fog/Driving Light Bulb Size: 9006
License Plate Light Bulb Size: 2825
Back Up Light Bulb Size: 7440
Front Side Marker Light Bulb Size: 2825
Rear Side Marker Light Bulb Size: 2825
Glove Box Light Bulb Size: 37
Step/Courtesy Light Bulb Size: 194 or 74 or DE3021
Trunk/Cargo Area Light Bulb Size: 194
Instrument-General Light Bulb Size: 194