Dave55: there is few options you can use with the HID lighting systems.
1] you can use the standby quatz system intreaged with the ballast system which it mean that the quatz light bulb light up both cold and hot start until the light get up to about 50% brightness then switched off and HID bulb will take care the rest of it
2] have the seprated stand by circuit for the HID lighting system but this will really increase the cost of materal and labour for this
3] this rathter new item came out called "arc keeper " http://www.bodine.com/products/specs/arckeeper.html
this link you will get to the arckeeper and it have good info there
it will get more popuar with HID system
if more question just drop a line here
merci , Marc