LED Video Light Kit, 3 Colors Dimmable, 2500K-9000K USB LED Video Conference Lighting with Adjustable Tripod Stand, Adjustable Clips for YouTube, Live Streaming, Lighting, Meetings, Gaming, Streaming

SKU: GW51.0080

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In terms of attachment, yes, but it depends on the curvature whether the ends of the lamp then illuminate the top edge of the monitor.  
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The lamp is in the middle, the webcam is now next to the lamp, but my monitor is also significantly larger than 27 inches. On the lamp, the cam is not more likely  
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Yes, in my case the power supply for the pc lamp runs via a USB connection or USB mains plug.  
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For me personally, always warm light as an atmosphere. There are certainly applications where cold or medium light is good. That's a matter of taste and I don't want to work under uncomfortable blue light.