With all due respect to juliahocking I would NOT hang this type of pendant over a stair void. One of your primary concerns should be how easy it is to change the light bulb. That particular fitting would be a nightmare to change as you need to reach above the shade, unscrew the the four little screws around the top (which you won't be able to see from below), carefully lift the glass shade down, change the bulb over and reverse the process while standing on top of a tall ladder which is probably balanced on stairs. Drop the glass shade in the process and you will probably be replacing the whole light fitting with something more sensible.

I don't think you need a feature pendant in this space as there is enough interest with the windows and ceiling detail. I would look at something more understated, possibly some wall mounted lights that shine light up to the ceiling which then bounces enough light down the stairwell. Just make sure you can reach them easily to change the bulbs, and mount them above your eyeline at the highest point.

Stair lights can also supplement your wall lights, and be very easy to change bulbs, but you need to get your electrican to work closely with your stair builder at an early stage to co-ordinate.

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Best of luck with your lighting,

Dr Retro

of Dr Retro House Calls