Has anyone used either of these as a nightlight for a child? The reviews seem to say that they are either brilliant or they stop working after ten minutes!? [[http://www.amazon.co.uk/gp/product/B000LQ1O94/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A39VTM0CZSRJZA moonlight]] [[http://www.amazon.co.uk/gp/product/B001KFKXUG/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A9ECNI7EPFXKY lifemax]]