Whatever page this document is from sure has some more information. Please read and post the entire document.

Age of the document also may matter. the old times with HPS/XPS and other outdated lighting surely put more lighting load on than modern LED.

If you design for an actual studio, you want to look at what they will use and how they are set up. There should be lighting design information that tells you lighting power density. The operators may know if all the lights rn at the same time or alternating. A professional studio for Opera may have much higher lighting level requirements than a local channel.

Please see the https://res.cloudinary.com/engineering-com/image/upload/v1708756882/tips/CIBSE_Guide_B-Heating_ventilating_air_conditioning_and_refrigeration_zhddcl.pdfattached document as requested.

It is from 2005. There was a huge revolution in lighting technology and loads now are significantly lower. For that reason alone I wouldn't use it.

If you read the text around the tables, you will see that for your specific project you need to learn the requirements of that specific studio. Learn about what they actually will install and how it will be used (all lights at once, or only a maximum number of lights at once).