It's a strip light but although I'm putting plugs in, after I drill the holes, as soon as I put the hooks up to hold the light the plugs just keep coming out....any suggestions?
The anchors (plugs) have to fit snugly into the drill holes. If your drill holes are too big, the anchors will fall out. Make sure that you are using the right size anchors and drill bits.
You need to buy special plugs for plasterboard. There are several systems for light, medium and heavy use. They mostly use some type of anchor that spreads out on the otherside of the board. They are quite effective, and really quite clever.
It's not a good idea to depend on the plasterboard for support. What you should do is locate the a ceiling joist (or truss) and secure the hooks to it with screws. You sure do not want to chance having the light come crashing down.