Candleholders have assumed various forms. The Prickett chandelier introduced in Italy in 1492 was a multiple-spiked holder mounted in groups around a decorative figure on the wall, with mutton-fat candles forced on the spikes. In the 15th century crystal chandeliers with small cups for holding wax candles lighted homes, ballrooms, and public gathering places. Of theses candles, 120 would have been required to equal the light of one 100 watt electric lamp, and the number required for a large room produced much heat. Candles in elaborate chandeliers were used for illumination of the House of Commons in England as late as 1834.