I've upgraded my torch. My beloved Nitecore D10 has been replaced by a Zebralight SC5 Fw. Both single AA. I'm as ever impressed by how much more efficient the newer light is. It has a flood beam, no throw to speak of, which I think I prefer for my EDC use. I got fed up by being dazzled by a hot spot, or having a spill so weak as to be useless. The old light's brightness was continuously variable. The new one has discrete levels, which I prefer because it means I know what trade off of light for battery life I am making. It has a fairly complex user interface, which I'm now familiar with (one advantage of EDC is that it gets used frequently). The main actual drawback is that it tries to come on at full brightness when I want a dimmer setting.