Romans used oil lamps for lighting generally, they had dipped tallow candles but the only uses we've seen of them in the imperial era are ritual use at altars,

Romans used oil lamps for lighting generally, they had dipped tallow candles but the only uses we've seen of them in the imperial era are ritual use at altars, and dip candle use was generally later than the period the dodecahedra come from. The use of tallow dip candles that look something like a modern candle for illumination was adopted later than these artifacts, and those candles weren't well quality controlled, you can find images of them from the 500s, there's no apparent standardization on size.