Replacing uplighter dimmer switch with 2 switches.Original has4 conn 2 br/2 blue and2 br coming from bottom os transformer to white reading goose neck light. New switch has only 3 connections,from left to right o/p1300w o/p2 100w I/p220/240v, Tom

Would you mind telling us what country you're in? Blue and brown sound like UK or European wiring colors.
Forgive me if I'm misreading the post.

Would you mind telling us what country you're in? Blue and brown sound like UK or European wiring colors.
Forgive me if I'm misreading the post.
My fault you are correct I am in the UK thanks for your interest. Tom

I'm not really sure what is meant by "i/p" and "o/p". Hopefully someone more qualified than myself will come along and answer your question.