Dear Reader / inside my reviews. The LED clamp lamp I bought for my 17 "notebook to still work reasonably acceptable even in dim light can. The light efficiency is very good. Unfortunately, the cable is a little short (10-15cm are there about), because at The USB ports are close to my notebook at the front. So I was ultimately forced even to get me a USB extension 15cm. And now the work in the dark or dusk, nothing stands in the way :-) Thanks and 5 star.