If you want to increase the luminosity and color
temperature (from 3200K yellow to 6000K super
Blue white) from your old car Head Lamp with same
power rating in safety way, please consider
Halogen Blue Coating Bulb (4000K to 6000K) price at HKD150.- HKD600.-
one pair.
Just replace the bulb and bulb socket H1/H4/H7
(Heat Resistant Max. at 250 degree C)
H.I.D.(High Intensity Discharge) Xenon Bulb system is more expensive to a old car (Cost HKD2-3K)
Refer to link:
http://www.osram.com.tw/products/automotive/upgrade/cool.jsp?pid=2_3_3_1