But there are some cars, eg BMW/Mini, where their models have
option extras that include HID retrofitting, approved by factory
(done at the authorized dealer of course). I believe LTA's rule on
the HID is based more on the factory's approved specifications for
that model.
quote from one.motoring.
http://www.onemotoring.com.sg/publish/onemotoring/en/lta_information_guidelines/modification_guide/hid_headlamps.html
"Qn: Can I retrofit my halogen headlamps with an after-market HID
headlamp system?
Ans: In general, we do not allow the retrofitting of HID lamp
systems on existing vehicles, unless it is duly certified
by the vehicle manufacturers.
So if Honda has a HID retrofit for the DC5 GSR, then fitting HID
in that is legal.... the retrofit kit has to be bought and done at
the authorized dealer of course. Same for the BMW 3-series.