The Beams LED is really ideal to provide in the dark for the light that one needs to initiate to nowhere. The daylight sensor prevents daytime unnecessary had switched on the light and when it gets dark they respond promptly, this, however, quite sensitive. How would you suggest I do not know why in the open, but they are also not intended for and therefore no deduction in the B-Note. The light is not super-bright but absolutely sufficient to just to see the most necessary and the possibility not to dazzle. I have been doing the first attempt in a Beam (s) the batteries are installed, who came from the Wii Balance Board and this could no longer operate. Beams for the residual current but still enough for a variety of activations over a period of about 3 weeks. The new batteries in the second beam (s) now hold for quite a while longer ... A small drawback is that you do not notice when the batteries give up. The LED is therefore not dark or at least it is not noticed - at some point simply is no longer on the light ... But that's no reason for me one point (star) deduct ...