Want a laugh about lights and bulbs?
I just bought my new place and it was specced up with GU10 downlighters throughout, rather than hanging pendant lights. Great.
When you buy a place, a survey is done and a report telling you it's energy efficiency - which allows space for any suggestions. Seeing as my place is new-build, it's REALLY efficient, but the jobsworth filling the form felt he had to put something in the "Recommendations" section. He recommended that swapping out all my downlighters for hanging pendants with low-energy bulbs could save me...
12p per month!
Wow. What an awesome suggestion. Don't get me wrong, 12p per month over a year would be £1.44! Nice savings. But wait...
I'd have to buy the bulbs, which would cost me over that. And the pendant fittings. Oh wait, I'd have to have the downlighters stripped out, my ceiling re-skimmed, looking at about a grand or so there...
What a tosser!
What you forget is that halogen has about 2000 hours of use on a good day. LED will have a lifetime of 20-25k. more on better brands, and even then, LED's never die, their lifetime is the time untill they reach 80% so they will still last long after this, before they hit 70 and 60%.
Also you shouldn't need to strip anythign usually, there is LED replacements for most any of the Halogen fittings today, both the 12V and 230V variants.
As for the OP. instead of those LED's I would suggest getting one of those with 3 LED's for for the 35 watt equivalents and 5-6 for the 50 Watt equivalents. Also don't get the cheapest brand LED. they have much shorter lifetimes. their light falloff and light color might not be what you expect and they might not even e uniform across the lights. The cheap ones also often have noticeable flicker in them while the more expensive like Philips don't have flicker and will all have uniform color and excellent lifetimes, they also give warranties on them.
Also something to remember about FCL spots. They are far more bulky and will stick out more, and they don't project the light forward like a LED and a good Halogen. so they won't be as good a spotlight.