I'd like to have a 5m LED strip lighting directed upwards from around 1m height (would be behind a desk and other furniture). My idea was a simple U shaped aluminium profile (so it can be screwed to the wall and will provide cover preventing directly seeing the strip), but I'm not sure how to put up a profile with screws when you have only 30 mm space between the two parallel sides of the U profile. So now I'm thinking an L shaped aluminium profile like this
with the 'vertical' side 'outside' (so not on the wall) for covering, and holding in place with something like this
Is an untreated aluminum profile suitable for cooling LEDs? If so, should I get the 2 mm or the 3 mm thick one?
What treatments can they do with aluminium? Should I try to look for some with treatment?
Any ideas how to better solve the problem?