This LED lamp uses the same basic geometry as https://cults3d.com/en/3d-model/home/holeylayers1, but the layers are taller and are rounded instead of having sharp edges. As a result it takes a bit longer to print; this part printed in 25 2/4 hours using a layer height of 0.200 mm and a print speed of 80 mm/sec.
The lamp is designed for an LED "puck" light. Battery operated lights are about $4 each; simply do a web search for "LED puck light" to find several sources. This blog page tells where you can get wall powered lights that are brighter and that work very well: http://birkbinnard.com/blog/wall-powered-led-lights/.