15 w tubes are 450mm would something like this do, i have fitted them up with Hook and loop sticky tape before 
https://www.screwfix.com/p/robus-spear-395mm-led-linear-cabinet-striplight-4w-520-550lm/595fh
https://www.screwfix.com/p/robus-spear-395mm-led-linear-cabinet-striplight-4w-520-550lm/595fh
