Instruct: Classify Amazon reviews into positive or negative sentiment
Query: DO NOT BUY

As mentioned by other reviewers, the switches on these lights are faulty. The lights flicker/dim when the light is moved. I purchased two of these lights and they both had the same problem. The light (when it stays on) is better than my previous book light. Slight movement or any re-adjustment of the light causes it to flicker or dim or turn off. Unusable.