I myself am not a friend of black lights, because the human eye (in contrast to many species of birds) UV light can not perceive, which means that you never know what - sometimes harmful - dose light you just exposes his retina, but the effects that can be achieved with it, of course, undisputed. Therefore, I have ordered the same three of these lamps and they assembled in a windowless room. There they bring then already all white and UV luminescent objects good shine. Already little ambient light makes the effect, however, disappear soon. The processing of the lamps corresponds approximately to what one knows of normal energy-saving lamps, the duty (to reach full brightness) appears subjectively few seconds. In order not to lose additional brightness, the lamp should be as free as possible of course assemble ... I have to simply uses a "building site Luster" (E27 socket with cable).