Hiya,
Have been researching changing interior bulbs for cool white (xenon temp) LEDs having done this on our Bongo. I prefer the look, the output is better and you can leave them on for a long time without draining the battery noticably. I also want to replace the sidelights with something close in temp to the HIDs.
Along the way I've found things are not as straighforward as they could be and there's a lot of confusing information around so I thought I'd post this in case it's useful for someone else.
For exterior bulbs see this http://www.consumabulbs.com/files/nproduct...=33&md=4653 for UK references and cross check against this http://www.whatbulb.com/2001-Lexus-GS300GS430 which has US references but is more accurate and complete.
But they're fairly easy compared to interior bulbs, I found a reference list on CL but it only gives US bulb types, here it is (thanks to rominl at CL, see his excellent FAQ for endless info about GS lighting):
backup [reversing] light - m2 (in newer models it might need M6 instead)
rear door bottom light - m4
rear passenger dome light - m4
front door bottom light - m4
front central dome light - m16
front map light - m17
side marker - m4
night time driving light - m4 (stock replacement) or m6 (brighter out of spec replacement)
foot well light - #74
glove box - #74
ignition - #74
vanity mirror - m24 (a bit fatter in shape but should fit)
trunk light - m4
rear license plate - m4
Judging by the owner's manual I would say the rear courtesy lights are the same fitment (type "F") as the front map lights but at a lower wattage.
The above list is just the start though as it's all US references and a pain to sort out so here's a load of cross references that can be used to find the bulbs in the UK (most common refs in bold)
M2 - 7440, 382, ba15s, p21w, 1156
M4 - 501, 194/168, 158, 2821, 12256, 2825, W5W, T10
M17 - BA9,BA9S,233, 1895, 57 also fit 756, 1815, 1889, 1891, 1893, 12929, 12814, P8701W
M16 -DE3021, DE3022, DE3175, DE3425, 211-2, 212-2, 12844 Dome light (10mmx31mm), 269, (10W)
M24 - DE3021, DE3022, DE3175, DE3425, 211-2, 212-2, 12844 , T8 (5W)
#74 - T5, 17 18 37 70
73 79 85 86 2721, 286
Hope this is useful. If you want to do most of the interior, the side repeaters with amber-flashing white-looking and the sidelights with bright xenon colour you're looking at about £60 for quality items from ultraleds, inc.p&p. My order should have been something along the lines of:
501/194/T10 New Mini Light Tower 9 x WA HB Leds AMBER x2 (repeaters)
The Ultimate I 501/T10/194 1 x 1 Watt Ultra Xenon White x5 (sidelights, reversing lights & boot)
U286W (286) Dash Board Slim wedge bulb White x3 (footwells and glovebox)
269 2 x High Brightness Xenon White SMT's 11 - 16v (One Bulb) x1 (front dome)
BA9 1W Wide Angled High Power Led Bulb Xenon White x2 (front map)
501/194/T10 New Mini Light Tower 9 Leds Xenon White x2 (rear courtesy)
Not doing the vanity mirrors, SWMBO wouldn't thank me as the wamer light is more flattering ;-)
Happy to stand corrected on all this by someone more in the know!
Cheers,
Paul