I have some heavy duty shelving and needed to mount a work light over one of the shelves. I fitted one of these
**LINK**
It gives a pretty good even light from a distance of 250mm or so. They are intended for under wall cupboard lighting so should work well over longer distances as well. It comes with screw fitting clips but I've stuck it in place with doubles sides foam tape.
If you don't want to fit a plug or don't have one etc then buy from B&Q but it will cost £3 more. The one from Screwfix just comes with bare wires but they have stripped the ends.
John
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