Do monitor light bars cause glare on the screen?

When properly tilted, no — the asymmetric optics are designed to throw light forward onto the desk rather than back at the panel. However, multiple community threads flag that incorrect angle or a too-thin monitor bezel can cause the bar to spill light onto the screen. Models with a motion sensor and auto-dim (BenQ Halo 2, ScreenBar Pro) and bars with wireless dials make fine-tuning easier.