2 - 3 candlesticks from Hannibals (which is a store chain). They burn brighly and don’t drip. Especially when they are new, aka long, that means the light source is higher up, giving everyone good reading light.
You can source candle holders fitting the vibe of just about every type of game (except sci-fi I guess) from any flea market.
That’s how I’ve been doing it for my Viking Fantasy home games and it really helps with immersion and keeping everyone’s focus on the table.