This is my first attempt at using variable color PLA filament. Here's a link to what I used:
I was not impressed with the results. The filament has long lengths between color changes, it is less transparent than regular PLA, and although it gives a nice surface finish it just looks dull and plain. So I'll try a different brand next time.
This lamp printed in slightly less than 13 1/4 hours using a print speed of 80 mm/sec and a 0.200 mm layer height. This lamp is designed to hold any one of several LED lights called "puck" lights. You can get these powered by either batteries of wall power. This blog page has links for wall powered lights that work well: http://birkbinnard.com/blog/wall-powered-led-lights/