Sounds like you're making her ready for the prom
Not sure what kind of light(s) you had but if I remember right mine had a good size hole for the wire to pass through (maybe 1/2") plus two screw holes. Yours the same?
Depending on how it looks you could use Marine tex or you could mix up some thickened resin if you have those materials handy.
Post up some pix and we can better advise you.