but ... after prolonged use (over 1 year) occur but on deficiencies. I use the lamp time at the table, sometimes at the desk, even the bed - she is so often reconnected. The spring in the clamping mechanism, however, is so strong that one with thicker plates both hands need to get the terminal far enough on. And then emerges a serious lack: the part that is clamped, is made of soft material so that it can be easily bent (!). Thus, it flexes, even if you change the direction of the lamp more often (ie times here, sometimes there is lit). The pressure exerted thereby, holding the clamping device does not stand, and thus the lamp over time is always slate. I have the part straightened out again a few times, but it flexes more quickly and it's only a matter of time until it breaks off. Too Bad.