How to mount lights?

[jsalyer]

My new garage has metal roofing on the ceiling. Trusses are on 4' centers. I was given several 4-bulb drop in ceiling grid lights that came out of a school. Lights are 4' X 2'. I want to mount them directly to the ceiling. I do not want to hang them. Beyond sheet metal screws(which I don't trust), I can't come up with anything to hold them securely to the ceiling. I considered toggle bolts but I really hate putting those big holes in the ceiling in case I need to swap out later.

Any other suggestions greatly appreciated.

 

[Norcal]

Sheet metal screws are more robust then toggle bolts ever will be, anytime something is fastened to framing members it will be much more secure then a piece of tin holding it to drywall.

 

[eljefino]

So is there an attic area? Is this an all steel building? Got pictures? I'm not following precisely.

I'd find a way to mount the fixtures long ways and perpindicular to the trusses, involving the trusses somehow.

 

[ForceFed70]

If it's wood trusses, then put a screw into the trusses.

If it's metal trusses I'd think about running some lumber across the trusses and affixing the fixture to that lumber.

 

[madjack]

1/2" Unistrut is how I'd do it.