The 30 candles with small bulbs produce an atmospheric light. I have not measured it in the lab, but I think that this candle so light like a real candle lit in about. As can be seen on the product image above, I have all 30 candles mounted on a 120cm large tree. However, I think that 30 candles should be enough even for a 180cm-tree. Is a matter of taste. We bought the electric candles primarily for security reasons (our daughter is just 14 months old). The only downside are the - though in green held, but - somewhat disturbing cables. The one does not stop with real candles. But I still think the candles great. And unlike so many LED candles, they produce a warm light here.