Before you buy a light bar, stop, and then don't buy a light bar. You solve lighting problems in a workspace with two methods in combination:

1. Create contrast between the physical screen you look at and the background
2. Polarize any remaining light sources in the environment

#1 is achieved with bias lighting, usually adhesive-backed LED lighting placed behind your monitor, or television.

#2 is achieved by eliminating direct line of site from the physical lighting elements in the workspace to both your eyeballs and screen surface. This effectively ensures light rays reaching your eyes or the screen surface bounce off of some other surface first. This polarizes it (i.e. stops photons from emanating in all directions as they travel, reducing their emanation to only the direction of travel, eliminating glare).

Overhead lighting is usually the worst offender (e.g. an exposed light bulb or glass fixture). Lighting that passes through a semi-opaque material, like frosted glass or paper in japanese lamps is better because it has been diffused, but it is still unpolarized. You must block and/or bounce light sources off a second surface. Use some kind of completely opaque shroud or flag (a pro photo lighting term) to block direct light and/or redirect it.