I have a fitting with 4 MR16 lamps and I would like ot consider changing to
LEDs.
In the base is a round transformer. Am I right in thinking that I need a
certain minimum load on this and I may have to retain at least one halogen
lamp to do this.
Alternatively should I remove the transformer and fit an LED Driver.

Any suggestions? It is the type where the lampholder can be slid along
conductive bars.