Digital cameras see black scrolling lines when filming light from my desk lamp
Cheap (to make) LED lights will flicker at twice the mains frequency. There are many ways of overcoming this in the design of lights, such as using a larger smoothing capacitor (which makes the light bulky), using a dedicated progressive LED driver IC (which turns off some of the LEDs but not all of them, so the light dims rather than going out every half cycle) or using a switched mode converter at a higher frequency (which is more complex than the more common capacitive dropper, but allows dimming - adjustable LED panels sold for use in photography will have this technology). 

Put a different bulb in the lamp, such as the one that's in your bedside lamp. Generally the more expensive and branded ones will have better smoothing circuitry.