Most of the illumination events continue on at least till Valentine’s Day, so you'll definitely be able to see them if you’re coming in January. Here are places with some of the largest events in the Kanto area.
Yomiuri Land http://www.yomiuriland.com/english/
Tokyo German Village https://www.tripadvisor.com/Attraction_Review-g1021262-d1423716-Reviews-Tokyo_German_Village-Sodegaura_Chiba_Prefecture_Kanto.html
Sagamiko Pleasure Forest http://www.sagamiko-resort.jp/