i searched around ebay and couldn't really understand one thing. for example if i bought a 150 w hps bulb and plugged it into any socket, would it work or would i have to buy a whole new lamp and stuff? same thing for metal halide? for example this
http://cgi.ebay.com/150-Watt-HPS-GROW-LIGHT-BULB-HYDROPONICS-NEW-CLEAR_W0QQitemZ270487729771QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3efa53366b
http://cgi.ebay.com/150-Watt-HPS-GROW-LIGHT-BULB-HYDROPONICS-NEW-CLEAR_W0QQitemZ270487729771QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3efa53366b