What kind of yellowing?

Hey there, I think it's a nitrogen deficiency! The yellowing starts from the older leaves.. This is because being in flowering, due to the deficiency, it pushes everything to the new ones and they turn yellow... try some NPK fertilizer! Humidity between 45%-55% during the flowering phase! Hope this helps!

It looks like it may be a little more widespread than typical fading during flowering. The humidity might be a little low, even during flowering. What is your watering regime like? I've had a plant yellow a bit like that when I was under watering it a little bit and causing issues with fertilizer salts while it was dry. Using a 444 and a 284 is also giving a lot of phosphorus, even during flowering, which can put the plant in a stressed state. That can be useful very late in flowering to cause a stress reaction/increased trichome production, but may be stressing the plant a bit early here. Happy growing! 🌱👍