I have vectorlite 1.5 Million Candlepower light I want to know the ac charging adapter specification. We kind of lost track of particular adapter in recent moving :(. we appreciate your help. thanks rabi

Most of the Vector spotlights use a class 2 charger with an output of 12VDC 400ma with a positive (+) center connector, which are very common. I have several of these chargers from different manufacturers, and I use them interchangably on whichever spotlight I happen to plug them into.
One complication with my Vectors is they use a coaxial connector plug on the spotlight end that is a size N, which is being phased out and Radio Shack doesn'd even carry any more. If you hae a box of misc chargers, find a 12VDC one with a connector that fits your 1.5MCP light, and that is probably the one that came with your light.
Note that you can also charge your light with the cigarette lighter adapter cord that came with it. So if you can't find an AC transformer that fits but you have your cigarette lighter adapter cord, you can buy one of those cigarette lighter size gadgets that plugs into an AC outlet, and then plug your cigarette lighter cord into that.