Britek#7711 Photography Studio 7711 300w Focusable Halogen Light with High Quality Cooling and material Safety Glass This light is made to avoid re-focusing everytime the target changes from its original location You can just simply adjust the light by adjusting the yellow knob without moving the light stand It is a clever design for your perfect studio image The set up is unbelievably easy Just plug in and play,you can easily make a perfect shoot