"warmly lit" is correct and usable in written English.
You can use it to describe a warm atmosphere or the feeling of being soothed and comforted. For example, "The room was warmly lit with a fire in the hearth, creating a cozy atmosphere."
I immediately congratulated myself for wearing undergarments and waited in one of the warmly lit bride boxes until Amy returned with an armful of gowns.
Surrounded by suitcases and warmly lit, this nerdy, bearded performer looks like a head of hair with some glasses peeking out.
At the jam, you'll find musicians of widely varying ages with widely varying levels of talent in a warmly lit rear room.
Shooting on location in Scotland, the filmmakers have made the streets and laboratories of their 19th-century Edinburgh seem Gothic and sinister, while the interiors -- where appropriate -- are warmly lit and elegantly Victorian.
While the rest of my family cooled off in the sea or dozed on loungers, I gorged on descriptions of snow-covered lands, warmly lit households and the chatter-filled balls and salons that left Prince Andrei Bolkonsky so terribly, desperately cold.
An elegant, bejewelled woman in a shimmering gown peers languorously out on to a crowded London thoroughfare, perhaps Regent Street or Piccadilly, from a plush, warmly lit salon, while a man faces away from the window with studied nonchalance, blowing smoke rings.
It may have been built to look old, but the souq is still a top spot for an evening out, wandering in and out of warmly-lit stalls and galleries selling everything from jewellery to spices, past groups of men smoking shisha and sipping mint tea.
But the world's epicurean travellers are also attracted by Lyon's warmly-lit bouchons (casual eateries) such as Café des Federations, the city's feather-weight quenelles (a type of dumpling) and the various bits of pig that get inventively stuffed, roasted and turned into paté and sausages.
Although Mr. Mendes's production, played on a bare wooden set designed by Tom Piper, starkly lit by Paul Pyant, tends to de-emphasize the warmly regenerative powers of the characters' sojourn in the forest, sprigs of green begin to make more frequent appearances when the stage gradually fills with the rustics.
