A few years ago I borrowed a friends LED dive light for a night dive in Bora Bora, and I must say that it is hands down the best dive light I have ever dove with. It was 1 single 5 watt LED bulb. In fact it was so bright that the light on the dive boat wasn't working at the time and the captain borrowed my dive light as an overhead light. After the dive everyone wanted to use it on subsequent dives. The spectrum is beautiful a true 10k