Quote:Oh - just one more question. The bulbs are GU10 - can I replace some of them with slightly brighter bulbs (if 'bulb' is still used)?
What are they at the moment? Halogen 35W or 50W? LED? That should be written on the bulb somewhere.
I've replaced all my 240V 50W GU10 halogen downlights with LED bulbs. I usually look for LEDs rated for at least 350 Lumens. You can find some sellers claiming 400-500 Lumens on ebay and elsewhere but beware...
Not all LEDs are reliable. I've had some fail after 6months. Others are still good after 2-3 years.
Not all LED are dimmable and those that are don't always dim very well.
Not all LED are exactly the same size as halogen. They vary in length and diameter. Even a 1mm difference can sometimes cause problems depending on the fitting. Some fittings are more tolerant than others.
The beam angle can vary from 36-180 degrees. I prefer the wider angle versions (say 100 degrees or more) for general lighting.
LED come in cold or warm white. I prefer warm white. The cold white can look brighter but also a bit harsh or even slightly blue.
Some LEDs are positively dangerous..
https://www.youtube.com/watch?v=keaE7QTKTYE