It really depends on how efficient the transformer is, if its pretty good
then inefficiencies should be low and the rise in volts minimal. Does the
transformer get very warm when driving all halogens?
Brian

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On Saturday, 31 August 2019 09:29:13 UTC+1, John wrote:
I have a light fitting - bars with slidable lampholders - powered from a
circular transformer.Torroidal?

I changed one halogen for a LED. Can I continue to change all 4 - or will
this cause problems due the reduced load on the transformer?

The toroidal output voltage will rise a bit if they're all changed. That
will affect LED life expectancy to some degree - it's still going to be
cheaper to run than halogens though. You may want to avoid cheapskate on the
edge lamps, they would be harder hit.


NT