I can see the light - kitchen cupboard pelmets

All I did with mine was to stick some duct tape on the inside of the pelmet to the bottom of the cupboard, you don't notice it unless you look underneath but if that bothers you another thing you could do is get some right angle plastic strip (they do it in B&Q) and use that instead. Trevor Smith

When I've done this job I've put a bead of suitably coloured mastic on the pelmet before fitting. Remove the excess afterwards and it looks excellent.

-- Nige Danton

Put some draught excluder foam in the gaps.

Seconded

Run a bead of coloured silicone along the inside

Tony

Thanks for all the ideas. I am going to try the coloured sealant/mastic first.

Thanks Painters10

The IKEA pelmets come with a strip of foam tape (thin version of draught proofing tape) to stick along the top edge of the pelmet for exactly this purpose.

Incidentally, I fix the lights to the back of the pelmet rather than the underside of the cupboard, but these are just a bare T5 fluorescent tube held by terry clips with remote electronic gear. You want the lights as near the front of the cupboards as you can position them to minimise reflections from the work surface and shiney items on it into your eyes when working on the worktop.