I have a question about it - what means, I think that is a celebration but..I din`t heared about it

 Just looked up kandil in the dictionary and I got this:

kandil gecesi one of five Islamic holy nights when the minarets are illuminated: Mevlit, Regaip, Miraç, Berat, Kadir.

If you google it you might get more information

And hayırlı means like good wishes like ´hayırlı olsun´ - ´may it be good/congratulations´

thank you ally, I have found it too, but..I wonder..there is any celebration today..in Turkiye

 Ok, done a bit of googling, tried to find something in English, found this and this

MEVLID-I NEBI (Mevlid Kandili)
Mevlid-i Nebi (mehv-LEED ee NEH-bee), the Prophet Muhammad´s birthday, is fixed as the 12th day of the 3rd month (Rebi´ ul-Evvel/Rabi´ ul-Awwal) of the Hijri calendar. It´s celebrated with mosque illuminations and special foods, and is estimated to fall on:

2010: 26 February

2011: 16 February

2012: 5 February

cok cok teşekkür ederim, you are great

Hmm just read through the articles again, and they give two different dates the 25th and the 26th... I don´t which one is right

today, because that message was posted by a turkish friend of mine

 My pleasure canım x

 Great, thanks for posting this topic, I never heard of this celebration before! But now I know... teşekkür canım

it is my pleasure canım; so we can say - for all turkish users HAYIRLI KANDILLER KUTLU OLSUNUZ

Good information on this from kurtlovesgrunge here. 

 evet hun.. to all Turkish users hayırlı kandiller kutlu olsunuz

 Thanks lir, great link