The filters are really easy to replace once you find the gels, a search for the mentioned rosco gels or ruby lith on google will get you sources. You have to be careful about cleaning and disassembly of the glass plates which sandwich the filters. There are 4 of them which slide in, they are wrapped together on the edges with colored tape. Just peel back the tape carefully over a trashcan as sometimes the glass edges may have cracks and shards may break off as glass dust or specs. You can find vinyl colored tape at the dollar store that matches the color edges too, and just wrap everything together.