I believe the best in the area, with the widest range of options is in Fethiye. Fethiye lighting centre. They only do lighting and have a shop with several display floors for you to see options. They will also 'make to measure' specialist lighting.
Helpful & reasonably priced we found. If you're looking for a large or specialist light(s) they will both deliver and fit for you.
They have a website (with English language option) but I would advise a visit - well worth it.
Leo that’s brilliant, do you have the website or address? I wonder if I had purchased a few lights if they would travel up to dalaman to fit them? Is it just a charge per light to fit