Sebi... thank you for posting the cct... I cannot get that circuit to work... I would bet my triac is not working the way yours works, or my light bulb is not resistive enough (125V, 1/2W power...)
Can you please tell me which TRIAC you used (the part number)
Eventually I will need this circuit to run an inductive load... but I thought I should first get it to work with a resistive load...