Thanks for that.
It's just that in the living room there is a light fitting with three traditional bayonet fitting incandescent lightbulbs each with 60 w. So a total output of 180 w. This is to be changed to a light fitting taking three GU10 LED bulbs.
Would the light output from a 50 w halogen, which you mention, be directly comparable to the light output from a 50 w incandescent bulb?
If it is, then I suppose I would require an LED with just slightly higher output.