is it okey to use a triac as light dimmer without a diac on its gate?
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This is an incorrect statement. While it is true they both will not conduct until a breakdown voltage is reached, this is where the similarities end. A zener diode will stay at the breakdown voltage, the Diacs voltage will drop. It kind of acts like a spark plug.A diac is just two 30V zener diodes back to back, it ensures that the capacitor charges upto approx 27V then it fires the triac.
Thank you sir. Can you please show me a diagram using zener diode instead of diac so that I can perform it easily.In the past i made i dimmer using two zeners and it worked just as well, its better to use it with the diac as its designed for that purpose.