I want to replace a 100w ceiling bulb in an ensuite with 50w
downlighters. Should 3 downlighters give about the same amount of
light, or are they very inefficient? Is there a rule of thumb method
for calculating how many would normally be used for a given floor area -
in this case, 3sq metres? Grateful for any advice.
They are _very_ inefficient.
It's not the lamps themselves, but that you are largely lighting
the room by bouncing light off the floor. I would strongly suggest
you rethink your lighting design. There's also the issue that you'll
be punching holes in the ceiling, which can let moisture and fire
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