Does effect works on object instances

I am creating 6 instance of object and then picking individual object based on condition and trying to enable/disable effects.

But it is not working, I saw it is working as a object not as a instance i.e. disable/enable to all instances.

Any workaround ?

What is the condition? Perhaps it is not specific enough?

You can use effects on object instances:

[attachment=0:2hra50dc][/attachment:2hra50dc]

I am trying to effect enable/disable based on object UID.

We can't guess what your code looks like.