First of all, QNH is not 18000 in any part of Turkey. Please check charts for QNH. It varies based on aerodrome. I advise you to read some documentation so you can understand the rules and dynamics of Turkish Airspace.
For the landing light error: It is 10,000 MSL at all time. So you must open landing lights when descending below 10,000ft and you must turn them off when climbing above 10,000ft. In that case, 7859 ft is not good enough... Like I said, 10,000 ft MSL is the key.