The ST2K light bar and ST4K both have very different beam patterns. Below you will find a short driving sequence of both these light bars which should give you a clear characterization of the difference between the two.
NOTE: The vehicle featured in this video has factory fitted Bi-LED head-lamps.
Also, check out our LED Light bar buyer's guide which has detailed description and night shots of our entire range. You will also find a very helpful comparison slider at the very top.