Domyst:
I always start my seedlings under fluorescent lighting, typically I use a single 23 watt CFL for 2 or 3 days then I'll add a few more bulbs for another week or so, then to HID.
Dr. Jekyll
Using HID for a new born seedlings is just plain stupid because it's not only a waste of electricity but is consuming the life span of an expensive bulb, and has a much higher risk of over-heating the seedling. HPS is not ideal for vegging but does work, so if you don't have a MH bulb, then don't be in a hurry to use your HID
Mr. Hyde