What's more important, heat or light?

[supersheep]

Hi!

I'm just wondering what's more important to a Phal orhid, heat or light?

I have a room with a windowsill which gets a fair amount of light, but it's a much colder room.

Or I have a room which is much warmer, but the only surface available for the orchid just doesn't get as much natural light. Though the room's used more often so it would get more artificial light in the evenings.

As it's winter at the moment, and the plant has finished flowering, been repotted and I want to encourage the roots to grow, I'm not sure what to do for the best...