Candle holders Both long and small, tea light candles burn nicely in Iittala candle holders. Do not burn ordinary candles right to the end: extinguish it approximately 1-2 cm above the glass candlestick, so that the heat of the flame does not crack the glass. Use only good quality metal-cupped tea lights (no other types of candles) in the lantern. The candles should have a maximum diameter of 42 millimeters. Leave an adequate gap for air to circulate between a tea light candle and the walls of a glass lantern. Also please follow the safety instructions when using the candleholder and lantern.