Weezard is right. You cannot use a regular household socket (even w/ a converter) into a HID socket. The rating of the electrical current at which the gas inside the bulb is ignited is completely different than the voltage rating required to fire your standard household bulbs.

Do a lil more research. If you are really wanting a cheap HID light, go to Loews or Home Depot and buy an HID Security light. About $70 to $80. Then you just wire that to an extension cord, plug-in, and grow