Mounting of 3 Electrical lights in roof

3 electrical lights to be mounted on roof of an apartment. Apartment is newly built by Obos. Example room is done, please see picture. Total length of cables required around 10 meters. Canal ( cable way) is bought from electroenterprenør, but there no elbows. If you can get elbows of matching type, it will be good. Else, we go without it. If price is not big , please get matching canal & elbows. I will return mine to electroenteprenør. I have lamps already. Please give a bud Preferred color is white, or egg-white is second preference