branches of them on torcheres perhaps.

Or "Vauvhall lights" which were small glass owls in which oil was poured.A wick was floated in the oil and then lit.The glass was colured, and the small "bowl" was hung on a wire loop.

As the name suggests they were used to illumninate teh Pleareu Gardens at Vauvhall,London.

Here is a description from Benjamin Silliman's (1779—1864), A Journal of Travels in England, Holland, and Scotland(1805 & 1806)

The entrance to the gardens presents you with double rows of these lamps arranged in perpendicular lines on the pillars, and then with other rows, corresponding with the form of the roof of the arched passage under which you enter. Along the concave of this roof, extending a great way into the gardens, other lamps are suspended so as to represent the starry heavens. Conceive farther that these lamps are are thus disposed in every part of the gardens, in very various and beautiful forms, among the trees and green leaves, in the alcoves, recesses, and orchestra, and that some are green, others red, others blue, &c. thus transmitting rays of these colours only, and you may then form some idea of the gardens of Vauxhall.

Mrs Cornelys of Carlisle House,Soho Square London , one of the first "nightclubs" if you like, used similar illuminations at some of her masquerades.