Light dimmer problem

[ardhuru]

I'd used 100K, 1W on 240 VAC.

Reducing the resistance would get you sharper edges, but then one needs a resistance of a higher wattage, so I finally settled on these, and its worked great for me.

[Megahertz]

I wonder if 4n25 can be used the same way?
(with 100k direct to Live and other end to neutral)

[ardhuru]

Looks like the 4n25 has only 1 diode at the input. You'd get only 1 pulse per cycle. If thats acceptable, I dont see why the 4n25 shouldnt work.

Regards,

Anand