Every Arpilo piece is lit by an ordinary flameless LED tealight. This page is everything about it.
With every burnt log, one warm flameless LED tealight, its cell fitted. Any other flameless LED tealight fits the same space. No open flame, ever.
Any flameless LED tealight. They are sold in packs of 12 or 24 at hardware stores, dollar stores and online for well under a dollar each. Warm white looks like a flame; cool white looks like a fridge. Get warm.
If you want longer nights, a rechargeable set (six lights, one charging tray, a remote) drops into the same seat. They are a little dimmer than a fresh coin-cell light, and it still lights the log and the stone on top.
Never a flame. A candle will ruin it. The warning is moulded inside every log.
Lift the log off: the tealight stands on the table underneath, switch and all. Nothing unscrews and nothing unclips.