Lamps, powered by Dumbledore or possibly rechargeable batteries. Candela Glow Lanterns by OXO ($39.99 for two) sit on their base to recharge and light up automatically when removed, they last for 8 hours after a full charge and unlike candles you can leave them unattended (and not worry about still having a house to come back to). There are different sizes and shapes available including these funky little slug chaps.
Should you desire a change of ambiance there are different coloured tops. Seem expensive? They also do a less glamorous nightlight/portable lantern, the Candela Guardian for $29.99.
All pictures are from the OXO website