Hello,
The 65Q70T has the brightness to perform well in the sun room. I would recommend looking at the 65Q80T. This TV is better suited for a Sun room. The Q80T has Ultra Viewing Angle, which is very important for well lit rooms. It is engineered to reduce glare and enhance color, providing a vibrant picture no matter where you sit.
https://www.bestbuy.com/site/samsung-65-class-qled-q80-series-4k-uhd-tv-smart-led-with-hdr/6402408.p?skuId=6402408 ^Cristian