Concept of Wahdat-ul-Wajood in Islam

The concept of wahdat-ul-wajood in Sufism (Islam) is only that every thing is created by GOD's Light (ALLAH's NOOR). Because ALLAH said that "HE is the Only in this universe". So no material is presented in this universe. ALLAH had transformed HIS NOOR in matters or materials and create this universe. So WE all are the ALLAH's NOOR..