Root Burn or root rot?

[khimnavany]

Thank you for the warm welcome!

Day/night temperature are 23/19°C. My hygrometer will arrive tomorrow but my home is definitely dry and the medium dries up within 4 days (so far).

The orchid gets about 10hrs of light from a western window with non direct sunlight.
As we are entering the winter months it'll get only 9-8hours until February. I do use artificial light between 3AM and 7AM just so it adds up to roughly 12-14hr during winter.

I'm glad to know it's neither burn nor rot, that's a relief!