I have a lot of these 12v MR16 ceiling mounted spots and a stack of
bulbs to fit them, but the one at the top of the stairwell went and that
is a ladder to reach, so I thought a long life LED might do the job...

....and to my surprise, its actually brighter than the incandescents.
It's sold as a '50W replacement'

Definitely recommended

--
Of what good are dead warriors? €¦ Warriors are those who desire battle
more than peace. Those who seek battle despite peace. Those who thump
their spears on the ground and talk of honor. Those who leap high the
battle dance and dream of glory €¦ The good of dead warriors, Mother, is
that they are dead.
Sheri S Tepper: The Awakeners.