MR16 light bulbs - can you replace 20w bulbs with 50w?

Posted 1st Jan 2015
I have a bunch of 20w mr16 spotlights in a room.
The room is a bit dark so I thought maybe I should stick more powerful bulbs in there like in the good old days when you could stick a 100w 'normal' bulb in place of a 60w
So I bought some 50w mr16 bulbs and swapped out the 20w bulbs.
The room does not seem to be any brighter. The new bulbs seem to be putting out the same light as the older weaker ones.

Are these bulbs not interchangeable then? Or is there something else that needs to be done/changed in the ceiling space?
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