Just installed the DDM tuning 55W 6000k HID kit in my 99 LX470. I've been running it without the additional relay harness w/o any issues whatsoever. But I wired the kit the way I wanted it (possibly similar to the creator of this thread...2000UZJ) The bulb was a tight squeeze into the headlight housing, but it fit. The bulb sits in there clocked differently than the standard halogen bulb, but it doesn't seem affect the beam coming out of the projector in anyway and there is a nice beam cutoff.
Below are some pics of the install, I basically chopped the bulb harness in the kit and soldered it directly to the factory connector for the low beam headlight that is attached the rear cover of the headlight housing. Photos are worth a 1000 words so here they are with some commentary to explain.
Cut the 2 wires that go from the bulb harness to the ballast
The headlight housing bulb access cover/wiring. Cut the connector off.
Strip insulation and prepare to solder together (use the skills you learned from playing with R/C cars)
Soldered with heat shrink tubing in place
You won't need these wires, cut them off.
Drill with 1" hole bit, don't need a high speed drill
Secure headlight housing bulb access cover, drill at slow speed to cut a 1" diameter hole (the HID bulb grommet is about 1" outer diameter on the DDM kit, other kits may have different diameter grommets)
Drilling complete, take your time drilling. The plastic part cannot be clamped down hard (just snug), rushing this can cause the part to rip out of the vise.
HID bulb harness with excess wiring trimmed away
The 2 factory wires (green and black) won't be used, I left them there just in case I need to put it back to stock.
HID bulb harness grommet seated
Bulb installed in headlight housing (RH side)
Bulb installed in headlight housing (LH side)
LH side all wired up. Ballast mounted with double sided tape, good ole zip ties hold everything else in place so nothing gets caught when installing the battery.
RH side
RH side again
55w 6000k low beams installed
35w 3000k fogs (soon to be installed)