A:AnswerThank you for your inquiry! The Insignia™ 65" Class QF Series QLED 4K UHD Smart Fire TV does produce around 300 to 400 nits of peak brightness. Keith | Insignia Support
A:AnswerHi there! Thanks for your question. Channel display differences like "RF" vs. "CH" can depend on signal type and tuner behavior. For personalized troubleshooting, please contact Insignia Support at 1-877-467-4289. They’ll be glad to assist!
— Shiela | Insignia Support