Need far more information. What model Roku (number, not name)? What light are you referring to? Is the Roku working, but the remote isn't doing anything? Have you tried the Roku app on a phone or tablet to see if you can control the device that way?
Dan Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.