Assuming a single candle is about $1 and they use about 8 candles for every light they replace, we're looking at $8 each evening. A single LED bulb consumes less than 14 watts many about 7 watts but let's assume 14. So 14 watts x 8 hours =112 watt hours or 0.112 kilowatt hours (old math). At a $1 per kilowatt hour that LED bulb would cost about 12 cents or $0.12 each evening. But if electricity cost $10 per kilowatt hour, then, yes, candles are less expensive.