If you look towards companies like Rosco or Lee they have hundreds of options for just this application. A sheet of Rosco 3408 takes you from about 5500K to 38

If you look towards companies like Rosco or Lee they have hundreds of options for just this application. A sheet of Rosco 3408 takes you from about 5500K to 3800K so a much warmer colour. A small sheet which should be enough goes for about £7 https://shopwl.com/rosco-roscolux-3408-roscosun-1-2-cto/ https://shopwl.com/rosco-roscolux-3408-roscosun-1-2-cto/ you can probably find it cheaper just by searching Rosco 3408