Didn't know that about flickering, interesting. Maintaining the candle properly by e.g. trimming the wick does help with a clean burn. Beeswax has almost no flicker and gives off light that's the most similar to sunlight, but it's quite expensive.

Refer to the refresh rate on your screen and make it even slower. There is a such thing as candle meditation, so the flickering not always regarded as bad. It'll definitely tire your eyes due to them fatiguing, Ikea makes LED candles if you're interested and anudril firmware flashlights have candle mode too.