What does description mean by suitable for led upgrade?
It means that it can be be used with tradional incadesent bulbs as well as modern LED bulbs.
What are the dimensions of the shade?
Shade dimensions are W: 13.7cm D: 8cm H: 12.4cm
Is the bulb visible from underneath the shade?
No, it is glare free fro underneath, however, top of the shade is open.
Is the on/off switch integral and if so, where is it situated?
This wall light has a toggle switch, situated undeath the shade.